Thread: why wal_max_size does not work?

Hello

max_wal_size is not the upper limit for pg_wal. Postgresql does not have upper limit for pg_wal at all. This is
documented:

https://www.postgresql.org/docs/10/runtime-config-wal.html
> Maximum size to let the WAL grow to between automatic WAL checkpoints. This is a soft limit; WAL size can exceed
max_wal_sizeunder special circumstances, like under heavy load, a failing archive_command, or a high wal_keep_segments
setting.

so check yours replication slots, archive_command (if archive_mode is enabled), wal_keep_segments

regards, Sergei

Thanks for the reply.

Yes, I understand wal_max_size is a soft limit. But we don’t' have heavy traffic. It's like 4 UPDATE per 2 seconds.
Our data folder is a 4GB network storage, the WAL file folder is around 3.7G.

So, light traffic with 3.7G WAL, no recycling.
We have archive_mode = off
And max_replication_slots = '10'

You can find my postgresql.conf in my first mail.

So, I wan to know under what kind of scenario that there will not be recycling old WAL files.
Is there any way I can check the recycling? For example, logs?

Attach logs

BRs,
Fan Liu

>>-----Original Message-----
>>From: Sergei Kornilov <sk@zsrv.org>
>>Sent: 2020年3月24日 20:33
>>To: Fan Liu <fan.liu@ericsson.com>; PostgreSQL mailing lists
>><pgsql-bugs@lists.postgresql.org>
>>Subject: Re: why wal_max_size does not work?
>>
>>Hello
>>
>>max_wal_size is not the upper limit for pg_wal. Postgresql does not have upper
>>limit for pg_wal at all. This is documented:
>>
>>https://www.postgresql.org/docs/10/runtime-config-wal.html
>>> Maximum size to let the WAL grow to between automatic WAL checkpoints. This
>>is a soft limit; WAL size can exceed max_wal_size under special circumstances,
>>like under heavy load, a failing archive_command, or a high wal_keep_segments
>>setting.
>>
>>so check yours replication slots, archive_command (if archive_mode is enabled),
>>wal_keep_segments
>>
>>regards, Sergei

On Fri, 27 Mar 2020 at 01:10, Fan Liu <fan.liu@ericsson.com> wrote:
>
> So, I wan to know under what kind of scenario that there will not be recycling old WAL files.
> Is there any way I can check the recycling? For example, logs?
>

please, i would like to see the contents of postgresql.base.conf',
maybe is changing a parameter that is not touched in postgresql.conf,
and postgresql.auto.conf for the same reason

also, show us the output of: select * from pg_replication_slots
if there's any replication slot not connected to the server is
protecting, primary will keep the wals until the server comes back

finally, while this seems not to be your case, a high
wal_keep_segments can cause this problem too

-- 
Jaime Casanova                      www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

Hello Jaime,

Thanks for the supporting. 

>>also, show us the output of: select * from pg_replication_slots if there's any
>>replication slot not connected to the server is protecting, primary will keep
>>the wals until the server comes back

One more question related with above scenario. If the replica NODE fixed and reconnect to primary success after some
time.
 
Then will the WAL be recycling? 

If I config archive, will this kind of issue be solved? 


Just in case I will also provide the log you requested. 

postgres=# select * from pg_replication_slots;
      slot_name       | plugin | slot_type | datoid | database | temporary | active | active_pid | xmin | catalog_xmin
|restart_lsn | confirmed_flush_lsn
 

----------------------+--------+-----------+--------+----------+-----------+--------+------------+------+--------------+-------------+---------------------
 eric_adp_ss7_db_pg_1 |        | physical  |        |          | f         | t      |      98153 |      |
|0/9003A78   |
 
 eric_adp_ss7_db_pg_2 |        | physical  |        |          | f         | t      |      98154 |      |
|0/9003A78   |
 
(2 rows)

postgres=#

--------------- postgresql.base.conf ---------------------------
cat /var/lib/postgresql/data/pgdata/postgresql.base.conf
# -----------------------------
# PostgreSQL configuration file
# -----------------------------
#
# This file consists of lines of the form:
#
#   name = value
#
# (The "=" is optional.)  Whitespace may be used.  Comments are introduced with
# "#" anywhere on a line.  The complete list of parameter names and allowed
# values can be found in the PostgreSQL documentation.
#
# The commented-out settings shown in this file represent the default values.
# Re-commenting a setting is NOT sufficient to revert it to the default value;
# you need to reload the server.
#
# This file is read on server startup and when the server receives a SIGHUP
# signal.  If you edit the file on a running system, you have to SIGHUP the
# server for the changes to take effect, run "pg_ctl reload", or execute
# "SELECT pg_reload_conf()".  Some parameters, which are marked below,
# require a server shutdown and restart to take effect.
#
# Any parameter can also be given as a command-line option to the server, e.g.,
# "postgres -c log_connections=on".  Some parameters can be changed at run time
# with the "SET" SQL command.
#
# Memory units:  kB = kilobytes        Time units:  ms  = milliseconds
#                MB = megabytes                     s   = seconds
#                GB = gigabytes                     min = minutes
#                TB = terabytes                     h   = hours
#                                                   d   = days


#------------------------------------------------------------------------------
# FILE LOCATIONS
#------------------------------------------------------------------------------

# The default values of these variables are driven from the -D command-line
# option or PGDATA environment variable, represented here as ConfigDir.

#data_directory = 'ConfigDir'        # use data in another directory
                    # (change requires restart)
#hba_file = 'ConfigDir/pg_hba.conf'    # host-based authentication file
                    # (change requires restart)
#ident_file = 'ConfigDir/pg_ident.conf'    # ident configuration file
                    # (change requires restart)

# If external_pid_file is not explicitly set, no extra PID file is written.
#external_pid_file = ''            # write an extra PID file
                    # (change requires restart)


#------------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#------------------------------------------------------------------------------

# - Connection Settings -

#listen_addresses = 'localhost'        # what IP address(es) to listen on;
                    # comma-separated list of addresses;
                    # defaults to 'localhost'; use '*' for all
                    # (change requires restart)
#port = 5432                # (change requires restart)
max_connections = 100            # (change requires restart)
#superuser_reserved_connections = 3    # (change requires restart)
#unix_socket_directories = '/var/run/postgresql, /tmp'    # comma-separated list of directories
                    # (change requires restart)
#unix_socket_group = ''            # (change requires restart)
#unix_socket_permissions = 0777        # begin with 0 to use octal notation
                    # (change requires restart)
#bonjour = off                # advertise server via Bonjour
                    # (change requires restart)
#bonjour_name = ''            # defaults to the computer name
                    # (change requires restart)

# - Security and Authentication -

#authentication_timeout = 1min        # 1s-600s
#ssl = off
#ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed SSL ciphers
#ssl_prefer_server_ciphers = on
#ssl_ecdh_curve = 'prime256v1'
#ssl_dh_params_file = ''
#ssl_cert_file = 'server.crt'
#ssl_key_file = 'server.key'
#ssl_ca_file = ''
#ssl_crl_file = ''
#password_encryption = md5        # md5 or scram-sha-256
#db_user_namespace = off
#row_security = on

# GSSAPI using Kerberos
#krb_server_keyfile = ''
#krb_caseins_users = off

# - TCP Keepalives -
# see "man 7 tcp" for details

#tcp_keepalives_idle = 0        # TCP_KEEPIDLE, in seconds;
                    # 0 selects the system default
#tcp_keepalives_interval = 0        # TCP_KEEPINTVL, in seconds;
                    # 0 selects the system default
#tcp_keepalives_count = 0        # TCP_KEEPCNT;
                    # 0 selects the system default


#------------------------------------------------------------------------------
# RESOURCE USAGE (except WAL)
#------------------------------------------------------------------------------

# - Memory -

shared_buffers = 128MB            # min 128kB
                    # (change requires restart)
#huge_pages = try            # on, off, or try
                    # (change requires restart)
#temp_buffers = 8MB            # min 800kB
#max_prepared_transactions = 0        # zero disables the feature
                    # (change requires restart)
# Caution: it is not advisable to set max_prepared_transactions nonzero unless
# you actively intend to use prepared transactions.
#work_mem = 4MB                # min 64kB
#maintenance_work_mem = 64MB        # min 1MB
#replacement_sort_tuples = 150000    # limits use of replacement selection sort
#autovacuum_work_mem = -1        # min 1MB, or -1 to use maintenance_work_mem
#max_stack_depth = 2MB            # min 100kB
dynamic_shared_memory_type = posix    # the default is the first option
                    # supported by the operating system:
                    #   posix
                    #   sysv
                    #   windows
                    #   mmap
                    # use none to disable dynamic shared memory
                    # (change requires restart)

# - Disk -

#temp_file_limit = -1            # limits per-process temp file space
                    # in kB, or -1 for no limit

# - Kernel Resource Usage -

#max_files_per_process = 1000        # min 25
                    # (change requires restart)
#shared_preload_libraries = ''        # (change requires restart)

# - Cost-Based Vacuum Delay -

#vacuum_cost_delay = 0            # 0-100 milliseconds
#vacuum_cost_page_hit = 1        # 0-10000 credits
#vacuum_cost_page_miss = 10        # 0-10000 credits
#vacuum_cost_page_dirty = 20        # 0-10000 credits
#vacuum_cost_limit = 200        # 1-10000 credits

# - Background Writer -

#bgwriter_delay = 200ms            # 10-10000ms between rounds
#bgwriter_lru_maxpages = 100        # 0-1000 max buffers written/round
#bgwriter_lru_multiplier = 2.0        # 0-10.0 multiplier on buffers scanned/round
#bgwriter_flush_after = 512kB        # measured in pages, 0 disables

# - Asynchronous Behavior -

#effective_io_concurrency = 1        # 1-1000; 0 disables prefetching
#max_worker_processes = 8        # (change requires restart)
#max_parallel_workers_per_gather = 2    # taken from max_parallel_workers
#max_parallel_workers = 8        # maximum number of max_worker_processes that
                    # can be used in parallel queries
#old_snapshot_threshold = -1        # 1min-60d; -1 disables; 0 is immediate
                    # (change requires restart)
#backend_flush_after = 0        # measured in pages, 0 disables


#------------------------------------------------------------------------------
# WRITE AHEAD LOG
#------------------------------------------------------------------------------

# - Settings -

#wal_level = replica            # minimal, replica, or logical
                    # (change requires restart)
#fsync = on                # flush data to disk for crash safety
                    # (turning this off can cause
                    # unrecoverable data corruption)
#synchronous_commit = on        # synchronization level;
                    # off, local, remote_write, remote_apply, or on
#wal_sync_method = fsync        # the default is the first option
                    # supported by the operating system:
                    #   open_datasync
                    #   fdatasync (default on Linux)
                    #   fsync
                    #   fsync_writethrough
                    #   open_sync
#full_page_writes = on            # recover from partial page writes
#wal_compression = off            # enable compression of full-page writes
#wal_log_hints = off            # also do full page writes of non-critical updates
                    # (change requires restart)
#wal_buffers = -1            # min 32kB, -1 sets based on shared_buffers
                    # (change requires restart)
#wal_writer_delay = 200ms        # 1-10000 milliseconds
#wal_writer_flush_after = 1MB        # measured in pages, 0 disables

#commit_delay = 0            # range 0-100000, in microseconds
#commit_siblings = 5            # range 1-1000

# - Checkpoints -

#checkpoint_timeout = 5min        # range 30s-1d
#max_wal_size = 1GB
#min_wal_size = 80MB
#checkpoint_completion_target = 0.5    # checkpoint target duration, 0.0 - 1.0
#checkpoint_flush_after = 256kB        # measured in pages, 0 disables
#checkpoint_warning = 30s        # 0 disables

# - Archiving -

#archive_mode = off        # enables archiving; off, on, or always
                # (change requires restart)
#archive_command = ''        # command to use to archive a logfile segment
                # placeholders: %p = path of file to archive
                #               %f = file name only
                # e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f'
#archive_timeout = 0        # force a logfile segment switch after this
                # number of seconds; 0 disables


#------------------------------------------------------------------------------
# REPLICATION
#------------------------------------------------------------------------------

# - Sending Server(s) -

# Set these on the master and on any standby that will send replication data.

#max_wal_senders = 10        # max number of walsender processes
                # (change requires restart)
#wal_keep_segments = 0        # in logfile segments, 16MB each; 0 disables
#wal_sender_timeout = 60s    # in milliseconds; 0 disables

#max_replication_slots = 10    # max number of replication slots
                # (change requires restart)
#track_commit_timestamp = off    # collect timestamp of transaction commit
                # (change requires restart)

# - Master Server -

# These settings are ignored on a standby server.

#synchronous_standby_names = ''    # standby servers that provide sync rep
                # method to choose sync standbys, number of sync standbys,
                # and comma-separated list of application_name
                # from standby(s); '*' = all
#vacuum_defer_cleanup_age = 0    # number of xacts by which cleanup is delayed

# - Standby Servers -

# These settings are ignored on a master server.

#hot_standby = on            # "off" disallows queries during recovery
                    # (change requires restart)
#max_standby_archive_delay = 30s    # max delay before canceling queries
                    # when reading WAL from archive;
                    # -1 allows indefinite delay
#max_standby_streaming_delay = 30s    # max delay before canceling queries
                    # when reading streaming WAL;
                    # -1 allows indefinite delay
#wal_receiver_status_interval = 10s    # send replies at least this often
                    # 0 disables
#hot_standby_feedback = off        # send info from standby to prevent
                    # query conflicts
#wal_receiver_timeout = 60s        # time that receiver waits for
                    # communication from master
                    # in milliseconds; 0 disables
#wal_retrieve_retry_interval = 5s    # time to wait before retrying to
                    # retrieve WAL after a failed attempt

# - Subscribers -

# These settings are ignored on a publisher.

#max_logical_replication_workers = 4    # taken from max_worker_processes
                    # (change requires restart)
#max_sync_workers_per_subscription = 2    # taken from max_logical_replication_workers


#------------------------------------------------------------------------------
# QUERY TUNING
#------------------------------------------------------------------------------

# - Planner Method Configuration -

#enable_bitmapscan = on
#enable_hashagg = on
#enable_hashjoin = on
#enable_indexscan = on
#enable_indexonlyscan = on
#enable_material = on
#enable_mergejoin = on
#enable_nestloop = on
#enable_seqscan = on
#enable_sort = on
#enable_tidscan = on

# - Planner Cost Constants -

#seq_page_cost = 1.0            # measured on an arbitrary scale
#random_page_cost = 4.0            # same scale as above
#cpu_tuple_cost = 0.01            # same scale as above
#cpu_index_tuple_cost = 0.005        # same scale as above
#cpu_operator_cost = 0.0025        # same scale as above
#parallel_tuple_cost = 0.1        # same scale as above
#parallel_setup_cost = 1000.0    # same scale as above
#min_parallel_table_scan_size = 8MB
#min_parallel_index_scan_size = 512kB
#effective_cache_size = 4GB

# - Genetic Query Optimizer -

#geqo = on
#geqo_threshold = 12
#geqo_effort = 5            # range 1-10
#geqo_pool_size = 0            # selects default based on effort
#geqo_generations = 0            # selects default based on effort
#geqo_selection_bias = 2.0        # range 1.5-2.0
#geqo_seed = 0.0            # range 0.0-1.0

# - Other Planner Options -

#default_statistics_target = 100    # range 1-10000
#constraint_exclusion = partition    # on, off, or partition
#cursor_tuple_fraction = 0.1        # range 0.0-1.0
#from_collapse_limit = 8
#join_collapse_limit = 8        # 1 disables collapsing of explicit
                    # JOIN clauses
#force_parallel_mode = off


#------------------------------------------------------------------------------
# ERROR REPORTING AND LOGGING
#------------------------------------------------------------------------------

# - Where to Log -

log_destination = 'stderr'        # Valid values are combinations of
                    # stderr, csvlog, syslog, and eventlog,
                    # depending on platform.  csvlog
                    # requires logging_collector to be on.

# This is used when logging to stderr:
logging_collector = on            # Enable capturing of stderr and csvlog
                    # into log files. Required to be on for
                    # csvlogs.
                    # (change requires restart)

# These are only used if logging_collector is on:
#log_directory = 'log'            # directory where log files are written,
                    # can be absolute or relative to PGDATA
#log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'    # log file name pattern,
                    # can include strftime() escapes
#log_file_mode = 0600            # creation mode for log files,
                    # begin with 0 to use octal notation
#log_truncate_on_rotation = off        # If on, an existing log file with the
                    # same name as the new log file will be
                    # truncated rather than appended to.
                    # But such truncation only occurs on
                    # time-driven rotation, not on restarts
                    # or size-driven rotation.  Default is
                    # off, meaning append to existing files
                    # in all cases.
#log_rotation_age = 1d            # Automatic rotation of logfiles will
                    # happen after that time.  0 disables.
#log_rotation_size = 10MB        # Automatic rotation of logfiles will
                    # happen after that much log output.
                    # 0 disables.

# These are relevant when logging to syslog:
#syslog_facility = 'LOCAL0'
#syslog_ident = 'postgres'
#syslog_sequence_numbers = on
#syslog_split_messages = on

# This is only relevant when logging to eventlog (win32):
# (change requires restart)
#event_source = 'PostgreSQL'

# - When to Log -

#log_min_messages = warning        # values in order of decreasing detail:
                    #   debug5
                    #   debug4
                    #   debug3
                    #   debug2
                    #   debug1
                    #   info
                    #   notice
                    #   warning
                    #   error
                    #   log
                    #   fatal
                    #   panic

#log_min_error_statement = error    # values in order of decreasing detail:
                    #   debug5
                    #   debug4
                    #   debug3
                    #   debug2
                    #   debug1
                    #   info
                    #   notice
                    #   warning
                    #   error
                    #   log
                    #   fatal
                    #   panic (effectively off)

#log_min_duration_statement = -1    # -1 is disabled, 0 logs all statements
                    # and their durations, > 0 logs only
                    # statements running at least this number
                    # of milliseconds


# - What to Log -

#debug_print_parse = off
#debug_print_rewritten = off
#debug_print_plan = off
#debug_pretty_print = on
#log_checkpoints = off
#log_connections = off
#log_disconnections = off
#log_duration = off
#log_error_verbosity = default        # terse, default, or verbose messages
#log_hostname = off
#log_line_prefix = '%m [%p] '        # special values:
log_line_prefix = '%m %d %u [%p]'
                    #   %a = application name
                    #   %u = user name
                    #   %d = database name
                    #   %r = remote host and port
                    #   %h = remote host
                    #   %p = process ID
                    #   %t = timestamp without milliseconds
                    #   %m = timestamp with milliseconds
                    #   %n = timestamp with milliseconds (as a Unix epoch)
                    #   %i = command tag
                    #   %e = SQL state
                    #   %c = session ID
                    #   %l = session line number
                    #   %s = session start timestamp
                    #   %v = virtual transaction ID
                    #   %x = transaction ID (0 if none)
                    #   %q = stop here in non-session
                    #        processes
                    #   %% = '%'
                    # e.g. '<%u%%%d> '
#log_lock_waits = off            # log lock waits >= deadlock_timeout
#log_statement = 'none'            # none, ddl, mod, all
#log_replication_commands = off
#log_temp_files = -1            # log temporary files equal or larger
                    # than the specified size in kilobytes;
                    # -1 disables, 0 logs all temp files
log_timezone = 'UTC'


# - Process Title -

#cluster_name = ''            # added to process titles if nonempty
                    # (change requires restart)
#update_process_title = on


#------------------------------------------------------------------------------
# RUNTIME STATISTICS
#------------------------------------------------------------------------------

# - Query/Index Statistics Collector -

#track_activities = on
#track_counts = on
#track_io_timing = off
#track_functions = none            # none, pl, all
#track_activity_query_size = 1024    # (change requires restart)
#stats_temp_directory = 'pg_stat_tmp'


# - Statistics Monitoring -

#log_parser_stats = off
#log_planner_stats = off
#log_executor_stats = off
#log_statement_stats = off


#------------------------------------------------------------------------------
# AUTOVACUUM PARAMETERS
#------------------------------------------------------------------------------

#autovacuum = on            # Enable autovacuum subprocess?  'on'
                    # requires track_counts to also be on.
#log_autovacuum_min_duration = -1    # -1 disables, 0 logs all actions and
                    # their durations, > 0 logs only
                    # actions running at least this number
                    # of milliseconds.
#autovacuum_max_workers = 3        # max number of autovacuum subprocesses
                    # (change requires restart)
#autovacuum_naptime = 1min        # time between autovacuum runs
#autovacuum_vacuum_threshold = 50    # min number of row updates before
                    # vacuum
#autovacuum_analyze_threshold = 50    # min number of row updates before
                    # analyze
#autovacuum_vacuum_scale_factor = 0.2    # fraction of table size before vacuum
#autovacuum_analyze_scale_factor = 0.1    # fraction of table size before analyze
#autovacuum_freeze_max_age = 200000000    # maximum XID age before forced vacuum
                    # (change requires restart)
#autovacuum_multixact_freeze_max_age = 400000000    # maximum multixact age
                    # before forced vacuum
                    # (change requires restart)
#autovacuum_vacuum_cost_delay = 20ms    # default vacuum cost delay for
                    # autovacuum, in milliseconds;
                    # -1 means use vacuum_cost_delay
#autovacuum_vacuum_cost_limit = -1    # default vacuum cost limit for
                    # autovacuum, -1 means use
                    # vacuum_cost_limit


#------------------------------------------------------------------------------
# CLIENT CONNECTION DEFAULTS
#------------------------------------------------------------------------------

# - Statement Behavior -

#client_min_messages = notice        # values in order of decreasing detail:
                    #   debug5
                    #   debug4
                    #   debug3
                    #   debug2
                    #   debug1
                    #   log
                    #   notice
                    #   warning
                    #   error
#search_path = '"$user", public'    # schema names
#default_tablespace = ''        # a tablespace name, '' uses the default
#temp_tablespaces = ''            # a list of tablespace names, '' uses
                    # only default tablespace
#check_function_bodies = on
#default_transaction_isolation = 'read committed'
#default_transaction_read_only = off
#default_transaction_deferrable = off
#session_replication_role = 'origin'
#statement_timeout = 0            # in milliseconds, 0 is disabled
#lock_timeout = 0            # in milliseconds, 0 is disabled
#idle_in_transaction_session_timeout = 0    # in milliseconds, 0 is disabled
#vacuum_freeze_min_age = 50000000
#vacuum_freeze_table_age = 150000000
#vacuum_multixact_freeze_min_age = 5000000
#vacuum_multixact_freeze_table_age = 150000000
#bytea_output = 'hex'            # hex, escape
#xmlbinary = 'base64'
#xmloption = 'content'
#gin_fuzzy_search_limit = 0
#gin_pending_list_limit = 4MB

# - Locale and Formatting -

datestyle = 'iso, mdy'
#intervalstyle = 'postgres'
timezone = 'UTC'
#timezone_abbreviations = 'Default'     # Select the set of available time zone
                    # abbreviations.  Currently, there are
                    #   Default
                    #   Australia (historical usage)
                    #   India
                    # You can create your own file in
                    # share/timezonesets/.
#extra_float_digits = 0            # min -15, max 3
#client_encoding = sql_ascii        # actually, defaults to database
                    # encoding

# These settings are initialized by initdb, but they can be changed.
lc_messages = 'en_US.UTF-8'            # locale for system error message
                    # strings
lc_monetary = 'en_US.UTF-8'            # locale for monetary formatting
lc_numeric = 'en_US.UTF-8'            # locale for number formatting
lc_time = 'en_US.UTF-8'                # locale for time formatting

# default configuration for text search
default_text_search_config = 'pg_catalog.english'

# - Other Defaults -

#dynamic_library_path = '$libdir'
#local_preload_libraries = ''
#session_preload_libraries = ''


#------------------------------------------------------------------------------
# LOCK MANAGEMENT
#------------------------------------------------------------------------------

#deadlock_timeout = 1s
#max_locks_per_transaction = 64        # min 10
                    # (change requires restart)
#max_pred_locks_per_transaction = 64    # min 10
                    # (change requires restart)
#max_pred_locks_per_relation = -2    # negative values mean
                    # (max_pred_locks_per_transaction
                    #  / -max_pred_locks_per_relation) - 1
#max_pred_locks_per_page = 2            # min 0


#------------------------------------------------------------------------------
# VERSION/PLATFORM COMPATIBILITY
#------------------------------------------------------------------------------

# - Previous PostgreSQL Versions -

#array_nulls = on
#backslash_quote = safe_encoding    # on, off, or safe_encoding
#default_with_oids = off
#escape_string_warning = on
#lo_compat_privileges = off
#operator_precedence_warning = off
#quote_all_identifiers = off
#standard_conforming_strings = on
#synchronize_seqscans = on

# - Other Platforms and Clients -

#transform_null_equals = off


#------------------------------------------------------------------------------
# ERROR HANDLING
#------------------------------------------------------------------------------

#exit_on_error = off            # terminate session on any error?
#restart_after_crash = on        # reinitialize after backend crash?
#data_sync_retry = off            # retry or panic on failure to fsync
                    # data?
                    # (change requires restart)


#------------------------------------------------------------------------------
# CONFIG FILE INCLUDES
#------------------------------------------------------------------------------

# These options allow settings to be loaded from files other than the
# default postgresql.conf.

#include_dir = ''            # include files ending in '.conf' from
                    # a directory, e.g., 'conf.d'
#include_if_exists = ''            # include file only if it exists
#include = ''                # include file


#------------------------------------------------------------------------------
# CUSTOMIZED OPTIONS
#------------------------------------------------------------------------------

# Add settings for extensions here


BRs,
Fan Liu
ADP Document Database PG

>>-----Original Message-----
>>From: Jaime Casanova <jaime.casanova@2ndquadrant.com>
>>Sent: 2020年3月27日 14:36
>>To: Fan Liu <fan.liu@ericsson.com>
>>Cc: Sergei Kornilov <sk@zsrv.org>; PostgreSQL mailing lists
>><pgsql-bugs@lists.postgresql.org>
>>Subject: Re: why wal_max_size does not work?
>>
>>On Fri, 27 Mar 2020 at 01:10, Fan Liu <fan.liu@ericsson.com> wrote:
>>>
>>> So, I wan to know under what kind of scenario that there will not be recycling
>>old WAL files.
>>> Is there any way I can check the recycling? For example, logs?
>>>
>>
>>please, i would like to see the contents of postgresql.base.conf', maybe is
>>changing a parameter that is not touched in postgresql.conf, and
>>postgresql.auto.conf for the same reason
>>
>>also, show us the output of: select * from pg_replication_slots if there's any
>>replication slot not connected to the server is protecting, primary will keep
>>the wals until the server comes back
>>
>>finally, while this seems not to be your case, a high wal_keep_segments can
>>cause this problem too
>>
>>--
>>Jaime Casanova                      www.2ndQuadrant.com
>>PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

Hello，

Any update?

I have another question. 
Now I have recovered the NODE by deleted some old WAL files. But I still keep the pg_wal folder around 2.4G.  
Currently, all replicas are up and working. On the replica NODE, the WAL files still keep and looks like will not be
recycling.
 
So, is this an expected behavior?  Should I clean up those old WAL files? (e.g. use pg_archivecleanup?) 


BRs,
Fan Liu
ADP Document Database PG

>>-----Original Message-----
>>From: Fan Liu
>>Sent: 2020年3月27日 15:12
>>To: Jaime Casanova <jaime.casanova@2ndquadrant.com>
>>Cc: Sergei Kornilov <sk@zsrv.org>; PostgreSQL mailing lists
>><pgsql-bugs@lists.postgresql.org>
>>Subject: RE: why wal_max_size does not work?
>>
>>Hello Jaime,
>>
>>Thanks for the supporting.
>>
>>>>also, show us the output of: select * from pg_replication_slots if
>>>>there's any replication slot not connected to the server is
>>>>protecting, primary will keep the wals until the server comes back
>>
>>One more question related with above scenario. If the replica NODE fixed and
>>reconnect to primary success after some time.
>>Then will the WAL be recycling?
>>
>>If I config archive, will this kind of issue be solved?
>>
>>
>>Just in case I will also provide the log you requested.
>>
>>postgres=# select * from pg_replication_slots;
>>      slot_name       | plugin | slot_type | datoid | database | temporary |
>>active | active_pid | xmin | catalog_xmin | restart_lsn | confirmed_flush_lsn
>>----------------------+--------+-----------+--------+----------+----------
>>-+--------+------------+------+--------------+-------------+--------------
>>-------
>> eric_adp_ss7_db_pg_1 |        | physical  |        |          | f         | t
>>|      98153 |      |              | 0/9003A78   |
>> eric_adp_ss7_db_pg_2 |        | physical  |        |          | f         | t
>>|      98154 |      |              | 0/9003A78   |
>>(2 rows)
>>
>>postgres=#
>>
>>--------------- postgresql.base.conf --------------------------- cat
>>/var/lib/postgresql/data/pgdata/postgresql.base.conf
>># -----------------------------
>># PostgreSQL configuration file
>># -----------------------------
>>#
>># This file consists of lines of the form:
>>#
>>#   name = value
>>#
>># (The "=" is optional.)  Whitespace may be used.  Comments are introduced with
>># "#" anywhere on a line.  The complete list of parameter names and allowed #
>>values can be found in the PostgreSQL documentation.
>>#
>># The commented-out settings shown in this file represent the default values.
>># Re-commenting a setting is NOT sufficient to revert it to the default value;
>># you need to reload the server.
>>#
>># This file is read on server startup and when the server receives a SIGHUP
>># signal.  If you edit the file on a running system, you have to SIGHUP the #
>>server for the changes to take effect, run "pg_ctl reload", or execute # "SELECT
>>pg_reload_conf()".  Some parameters, which are marked below, # require a server
>>shutdown and restart to take effect.
>>#
>># Any parameter can also be given as a command-line option to the server, e.g.,
>># "postgres -c log_connections=on".  Some parameters can be changed at run time
>># with the "SET" SQL command.
>>#
>># Memory units:  kB = kilobytes        Time units:  ms  = milliseconds
>>#                MB = megabytes                     s   = seconds
>>#                GB = gigabytes                     min = minutes
>>#                TB = terabytes                     h   = hours
>>#                                                   d   = days
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># FILE LOCATIONS
>>#-------------------------------------------------------------------------
>>-----
>>
>># The default values of these variables are driven from the -D command-line
>># option or PGDATA environment variable, represented here as ConfigDir.
>>
>>#data_directory = 'ConfigDir'        # use data in another directory
>>                    # (change requires restart)
>>#hba_file = 'ConfigDir/pg_hba.conf'    # host-based authentication file
>>                    # (change requires restart)
>>#ident_file = 'ConfigDir/pg_ident.conf'    # ident configuration file
>>                    # (change requires restart)
>>
>># If external_pid_file is not explicitly set, no extra PID file is written.
>>#external_pid_file = ''            # write an extra PID file
>>                    # (change requires restart)
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># CONNECTIONS AND AUTHENTICATION
>>#-------------------------------------------------------------------------
>>-----
>>
>># - Connection Settings -
>>
>>#listen_addresses = 'localhost'        # what IP address(es) to listen on;
>>                    # comma-separated list of addresses;
>>                    # defaults to 'localhost'; use '*' for all
>>                    # (change requires restart)
>>#port = 5432                # (change requires restart)
>>max_connections = 100            # (change requires restart)
>>#superuser_reserved_connections = 3    # (change requires restart)
>>#unix_socket_directories = '/var/run/postgresql, /tmp'    # comma-separated
>>list of directories
>>                    # (change requires restart)
>>#unix_socket_group = ''            # (change requires restart)
>>#unix_socket_permissions = 0777        # begin with 0 to use octal notation
>>                    # (change requires restart)
>>#bonjour = off                # advertise server via Bonjour
>>                    # (change requires restart)
>>#bonjour_name = ''            # defaults to the computer name
>>                    # (change requires restart)
>>
>># - Security and Authentication -
>>
>>#authentication_timeout = 1min        # 1s-600s
>>#ssl = off
>>#ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed SSL ciphers
>>#ssl_prefer_server_ciphers = on #ssl_ecdh_curve = 'prime256v1'
>>#ssl_dh_params_file = ''
>>#ssl_cert_file = 'server.crt'
>>#ssl_key_file = 'server.key'
>>#ssl_ca_file = ''
>>#ssl_crl_file = ''
>>#password_encryption = md5        # md5 or scram-sha-256
>>#db_user_namespace = off
>>#row_security = on
>>
>># GSSAPI using Kerberos
>>#krb_server_keyfile = ''
>>#krb_caseins_users = off
>>
>># - TCP Keepalives -
>># see "man 7 tcp" for details
>>
>>#tcp_keepalives_idle = 0        # TCP_KEEPIDLE, in seconds;
>>                    # 0 selects the system default
>>#tcp_keepalives_interval = 0        # TCP_KEEPINTVL, in seconds;
>>                    # 0 selects the system default
>>#tcp_keepalives_count = 0        # TCP_KEEPCNT;
>>                    # 0 selects the system default
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># RESOURCE USAGE (except WAL)
>>#-------------------------------------------------------------------------
>>-----
>>
>># - Memory -
>>
>>shared_buffers = 128MB            # min 128kB
>>                    # (change requires restart)
>>#huge_pages = try            # on, off, or try
>>                    # (change requires restart)
>>#temp_buffers = 8MB            # min 800kB
>>#max_prepared_transactions = 0        # zero disables the feature
>>                    # (change requires restart)
>># Caution: it is not advisable to set max_prepared_transactions nonzero unless
>># you actively intend to use prepared transactions.
>>#work_mem = 4MB                # min 64kB
>>#maintenance_work_mem = 64MB        # min 1MB
>>#replacement_sort_tuples = 150000    # limits use of replacement selection sort
>>#autovacuum_work_mem = -1        # min 1MB, or -1 to use maintenance_work_mem
>>#max_stack_depth = 2MB            # min 100kB
>>dynamic_shared_memory_type = posix    # the default is the first option
>>                    # supported by the operating system:
>>                    #   posix
>>                    #   sysv
>>                    #   windows
>>                    #   mmap
>>                    # use none to disable dynamic shared memory
>>                    # (change requires restart)
>>
>># - Disk -
>>
>>#temp_file_limit = -1            # limits per-process temp file space
>>                    # in kB, or -1 for no limit
>>
>># - Kernel Resource Usage -
>>
>>#max_files_per_process = 1000        # min 25
>>                    # (change requires restart)
>>#shared_preload_libraries = ''        # (change requires restart)
>>
>># - Cost-Based Vacuum Delay -
>>
>>#vacuum_cost_delay = 0            # 0-100 milliseconds
>>#vacuum_cost_page_hit = 1        # 0-10000 credits
>>#vacuum_cost_page_miss = 10        # 0-10000 credits
>>#vacuum_cost_page_dirty = 20        # 0-10000 credits
>>#vacuum_cost_limit = 200        # 1-10000 credits
>>
>># - Background Writer -
>>
>>#bgwriter_delay = 200ms            # 10-10000ms between rounds
>>#bgwriter_lru_maxpages = 100        # 0-1000 max buffers written/round
>>#bgwriter_lru_multiplier = 2.0        # 0-10.0 multiplier on buffers
>>scanned/round
>>#bgwriter_flush_after = 512kB        # measured in pages, 0 disables
>>
>># - Asynchronous Behavior -
>>
>>#effective_io_concurrency = 1        # 1-1000; 0 disables prefetching
>>#max_worker_processes = 8        # (change requires restart)
>>#max_parallel_workers_per_gather = 2    # taken from max_parallel_workers
>>#max_parallel_workers = 8        # maximum number of max_worker_processes that
>>                    # can be used in parallel queries
>>#old_snapshot_threshold = -1        # 1min-60d; -1 disables; 0 is immediate
>>                    # (change requires restart)
>>#backend_flush_after = 0        # measured in pages, 0 disables
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># WRITE AHEAD LOG
>>#-------------------------------------------------------------------------
>>-----
>>
>># - Settings -
>>
>>#wal_level = replica            # minimal, replica, or logical
>>                    # (change requires restart)
>>#fsync = on                # flush data to disk for crash safety
>>                    # (turning this off can cause
>>                    # unrecoverable data corruption)
>>#synchronous_commit = on        # synchronization level;
>>                    # off, local, remote_write, remote_apply, or on
>>#wal_sync_method = fsync        # the default is the first option
>>                    # supported by the operating system:
>>                    #   open_datasync
>>                    #   fdatasync (default on Linux)
>>                    #   fsync
>>                    #   fsync_writethrough
>>                    #   open_sync
>>#full_page_writes = on            # recover from partial page writes
>>#wal_compression = off            # enable compression of full-page writes
>>#wal_log_hints = off            # also do full page writes of non-critical
>>updates
>>                    # (change requires restart)
>>#wal_buffers = -1            # min 32kB, -1 sets based on shared_buffers
>>                    # (change requires restart)
>>#wal_writer_delay = 200ms        # 1-10000 milliseconds
>>#wal_writer_flush_after = 1MB        # measured in pages, 0 disables
>>
>>#commit_delay = 0            # range 0-100000, in microseconds
>>#commit_siblings = 5            # range 1-1000
>>
>># - Checkpoints -
>>
>>#checkpoint_timeout = 5min        # range 30s-1d
>>#max_wal_size = 1GB
>>#min_wal_size = 80MB
>>#checkpoint_completion_target = 0.5    # checkpoint target duration, 0.0 - 1.0
>>#checkpoint_flush_after = 256kB        # measured in pages, 0 disables
>>#checkpoint_warning = 30s        # 0 disables
>>
>># - Archiving -
>>
>>#archive_mode = off        # enables archiving; off, on, or always
>>                # (change requires restart)
>>#archive_command = ''        # command to use to archive a logfile segment
>>                # placeholders: %p = path of file to archive
>>                #               %f = file name only
>>                # e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p
>>/mnt/server/archivedir/%f'
>>#archive_timeout = 0        # force a logfile segment switch after this
>>                # number of seconds; 0 disables
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># REPLICATION
>>#-------------------------------------------------------------------------
>>-----
>>
>># - Sending Server(s) -
>>
>># Set these on the master and on any standby that will send replication data.
>>
>>#max_wal_senders = 10        # max number of walsender processes
>>                # (change requires restart)
>>#wal_keep_segments = 0        # in logfile segments, 16MB each; 0 disables
>>#wal_sender_timeout = 60s    # in milliseconds; 0 disables
>>
>>#max_replication_slots = 10    # max number of replication slots
>>                # (change requires restart)
>>#track_commit_timestamp = off    # collect timestamp of transaction commit
>>                # (change requires restart)
>>
>># - Master Server -
>>
>># These settings are ignored on a standby server.
>>
>>#synchronous_standby_names = ''    # standby servers that provide sync rep
>>                # method to choose sync standbys, number of sync standbys,
>>                # and comma-separated list of application_name
>>                # from standby(s); '*' = all
>>#vacuum_defer_cleanup_age = 0    # number of xacts by which cleanup is delayed
>>
>># - Standby Servers -
>>
>># These settings are ignored on a master server.
>>
>>#hot_standby = on            # "off" disallows queries during recovery
>>                    # (change requires restart)
>>#max_standby_archive_delay = 30s    # max delay before canceling queries
>>                    # when reading WAL from archive;
>>                    # -1 allows indefinite delay
>>#max_standby_streaming_delay = 30s    # max delay before canceling queries
>>                    # when reading streaming WAL;
>>                    # -1 allows indefinite delay
>>#wal_receiver_status_interval = 10s    # send replies at least this often
>>                    # 0 disables
>>#hot_standby_feedback = off        # send info from standby to prevent
>>                    # query conflicts
>>#wal_receiver_timeout = 60s        # time that receiver waits for
>>                    # communication from master
>>                    # in milliseconds; 0 disables
>>#wal_retrieve_retry_interval = 5s    # time to wait before retrying to
>>                    # retrieve WAL after a failed attempt
>>
>># - Subscribers -
>>
>># These settings are ignored on a publisher.
>>
>>#max_logical_replication_workers = 4    # taken from max_worker_processes
>>                    # (change requires restart)
>>#max_sync_workers_per_subscription = 2    # taken from
>>max_logical_replication_workers
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># QUERY TUNING
>>#-------------------------------------------------------------------------
>>-----
>>
>># - Planner Method Configuration -
>>
>>#enable_bitmapscan = on
>>#enable_hashagg = on
>>#enable_hashjoin = on
>>#enable_indexscan = on
>>#enable_indexonlyscan = on
>>#enable_material = on
>>#enable_mergejoin = on
>>#enable_nestloop = on
>>#enable_seqscan = on
>>#enable_sort = on
>>#enable_tidscan = on
>>
>># - Planner Cost Constants -
>>
>>#seq_page_cost = 1.0            # measured on an arbitrary scale
>>#random_page_cost = 4.0            # same scale as above
>>#cpu_tuple_cost = 0.01            # same scale as above
>>#cpu_index_tuple_cost = 0.005        # same scale as above
>>#cpu_operator_cost = 0.0025        # same scale as above
>>#parallel_tuple_cost = 0.1        # same scale as above
>>#parallel_setup_cost = 1000.0    # same scale as above
>>#min_parallel_table_scan_size = 8MB
>>#min_parallel_index_scan_size = 512kB
>>#effective_cache_size = 4GB
>>
>># - Genetic Query Optimizer -
>>
>>#geqo = on
>>#geqo_threshold = 12
>>#geqo_effort = 5            # range 1-10
>>#geqo_pool_size = 0            # selects default based on effort
>>#geqo_generations = 0            # selects default based on effort
>>#geqo_selection_bias = 2.0        # range 1.5-2.0
>>#geqo_seed = 0.0            # range 0.0-1.0
>>
>># - Other Planner Options -
>>
>>#default_statistics_target = 100    # range 1-10000
>>#constraint_exclusion = partition    # on, off, or partition
>>#cursor_tuple_fraction = 0.1        # range 0.0-1.0
>>#from_collapse_limit = 8
>>#join_collapse_limit = 8        # 1 disables collapsing of explicit
>>                    # JOIN clauses
>>#force_parallel_mode = off
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># ERROR REPORTING AND LOGGING
>>#-------------------------------------------------------------------------
>>-----
>>
>># - Where to Log -
>>
>>log_destination = 'stderr'        # Valid values are combinations of
>>                    # stderr, csvlog, syslog, and eventlog,
>>                    # depending on platform.  csvlog
>>                    # requires logging_collector to be on.
>>
>># This is used when logging to stderr:
>>logging_collector = on            # Enable capturing of stderr and csvlog
>>                    # into log files. Required to be on for
>>                    # csvlogs.
>>                    # (change requires restart)
>>
>># These are only used if logging_collector is on:
>>#log_directory = 'log'            # directory where log files are written,
>>                    # can be absolute or relative to PGDATA
>>#log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'    # log file name pattern,
>>                    # can include strftime() escapes
>>#log_file_mode = 0600            # creation mode for log files,
>>                    # begin with 0 to use octal notation
>>#log_truncate_on_rotation = off        # If on, an existing log file with the
>>                    # same name as the new log file will be
>>                    # truncated rather than appended to.
>>                    # But such truncation only occurs on
>>                    # time-driven rotation, not on restarts
>>                    # or size-driven rotation.  Default is
>>                    # off, meaning append to existing files
>>                    # in all cases.
>>#log_rotation_age = 1d            # Automatic rotation of logfiles will
>>                    # happen after that time.  0 disables.
>>#log_rotation_size = 10MB        # Automatic rotation of logfiles will
>>                    # happen after that much log output.
>>                    # 0 disables.
>>
>># These are relevant when logging to syslog:
>>#syslog_facility = 'LOCAL0'
>>#syslog_ident = 'postgres'
>>#syslog_sequence_numbers = on
>>#syslog_split_messages = on
>>
>># This is only relevant when logging to eventlog (win32):
>># (change requires restart)
>>#event_source = 'PostgreSQL'
>>
>># - When to Log -
>>
>>#log_min_messages = warning        # values in order of decreasing detail:
>>                    #   debug5
>>                    #   debug4
>>                    #   debug3
>>                    #   debug2
>>                    #   debug1
>>                    #   info
>>                    #   notice
>>                    #   warning
>>                    #   error
>>                    #   log
>>                    #   fatal
>>                    #   panic
>>
>>#log_min_error_statement = error    # values in order of decreasing detail:
>>                    #   debug5
>>                    #   debug4
>>                    #   debug3
>>                    #   debug2
>>                    #   debug1
>>                    #   info
>>                    #   notice
>>                    #   warning
>>                    #   error
>>                    #   log
>>                    #   fatal
>>                    #   panic (effectively off)
>>
>>#log_min_duration_statement = -1    # -1 is disabled, 0 logs all statements
>>                    # and their durations, > 0 logs only
>>                    # statements running at least this number
>>                    # of milliseconds
>>
>>
>># - What to Log -
>>
>>#debug_print_parse = off
>>#debug_print_rewritten = off
>>#debug_print_plan = off
>>#debug_pretty_print = on
>>#log_checkpoints = off
>>#log_connections = off
>>#log_disconnections = off
>>#log_duration = off
>>#log_error_verbosity = default        # terse, default, or verbose messages
>>#log_hostname = off
>>#log_line_prefix = '%m [%p] '        # special values:
>>log_line_prefix = '%m %d %u [%p]'
>>                    #   %a = application name
>>                    #   %u = user name
>>                    #   %d = database name
>>                    #   %r = remote host and port
>>                    #   %h = remote host
>>                    #   %p = process ID
>>                    #   %t = timestamp without milliseconds
>>                    #   %m = timestamp with milliseconds
>>                    #   %n = timestamp with milliseconds (as a Unix epoch)
>>                    #   %i = command tag
>>                    #   %e = SQL state
>>                    #   %c = session ID
>>                    #   %l = session line number
>>                    #   %s = session start timestamp
>>                    #   %v = virtual transaction ID
>>                    #   %x = transaction ID (0 if none)
>>                    #   %q = stop here in non-session
>>                    #        processes
>>                    #   %% = '%'
>>                    # e.g. '<%u%%%d> '
>>#log_lock_waits = off            # log lock waits >= deadlock_timeout
>>#log_statement = 'none'            # none, ddl, mod, all
>>#log_replication_commands = off
>>#log_temp_files = -1            # log temporary files equal or larger
>>                    # than the specified size in kilobytes;
>>                    # -1 disables, 0 logs all temp files log_timezone = 'UTC'
>>
>>
>># - Process Title -
>>
>>#cluster_name = ''            # added to process titles if nonempty
>>                    # (change requires restart)
>>#update_process_title = on
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># RUNTIME STATISTICS
>>#-------------------------------------------------------------------------
>>-----
>>
>># - Query/Index Statistics Collector -
>>
>>#track_activities = on
>>#track_counts = on
>>#track_io_timing = off
>>#track_functions = none            # none, pl, all
>>#track_activity_query_size = 1024    # (change requires restart)
>>#stats_temp_directory = 'pg_stat_tmp'
>>
>>
>># - Statistics Monitoring -
>>
>>#log_parser_stats = off
>>#log_planner_stats = off
>>#log_executor_stats = off
>>#log_statement_stats = off
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># AUTOVACUUM PARAMETERS
>>#-------------------------------------------------------------------------
>>-----
>>
>>#autovacuum = on            # Enable autovacuum subprocess?  'on'
>>                    # requires track_counts to also be on.
>>#log_autovacuum_min_duration = -1    # -1 disables, 0 logs all actions and
>>                    # their durations, > 0 logs only
>>                    # actions running at least this number
>>                    # of milliseconds.
>>#autovacuum_max_workers = 3        # max number of autovacuum subprocesses
>>                    # (change requires restart)
>>#autovacuum_naptime = 1min        # time between autovacuum runs
>>#autovacuum_vacuum_threshold = 50    # min number of row updates before
>>                    # vacuum
>>#autovacuum_analyze_threshold = 50    # min number of row updates before
>>                    # analyze
>>#autovacuum_vacuum_scale_factor = 0.2    # fraction of table size before
>>vacuum
>>#autovacuum_analyze_scale_factor = 0.1    # fraction of table size before
>>analyze
>>#autovacuum_freeze_max_age = 200000000    # maximum XID age before forced
>>vacuum
>>                    # (change requires restart)
>>#autovacuum_multixact_freeze_max_age = 400000000    # maximum multixact age
>>                    # before forced vacuum
>>                    # (change requires restart)
>>#autovacuum_vacuum_cost_delay = 20ms    # default vacuum cost delay for
>>                    # autovacuum, in milliseconds;
>>                    # -1 means use vacuum_cost_delay
>>#autovacuum_vacuum_cost_limit = -1    # default vacuum cost limit for
>>                    # autovacuum, -1 means use
>>                    # vacuum_cost_limit
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># CLIENT CONNECTION DEFAULTS
>>#-------------------------------------------------------------------------
>>-----
>>
>># - Statement Behavior -
>>
>>#client_min_messages = notice        # values in order of decreasing detail:
>>                    #   debug5
>>                    #   debug4
>>                    #   debug3
>>                    #   debug2
>>                    #   debug1
>>                    #   log
>>                    #   notice
>>                    #   warning
>>                    #   error
>>#search_path = '"$user", public'    # schema names
>>#default_tablespace = ''        # a tablespace name, '' uses the default
>>#temp_tablespaces = ''            # a list of tablespace names, '' uses
>>                    # only default tablespace
>>#check_function_bodies = on
>>#default_transaction_isolation = 'read committed'
>>#default_transaction_read_only = off
>>#default_transaction_deferrable = off
>>#session_replication_role = 'origin'
>>#statement_timeout = 0            # in milliseconds, 0 is disabled
>>#lock_timeout = 0            # in milliseconds, 0 is disabled
>>#idle_in_transaction_session_timeout = 0    # in milliseconds, 0 is disabled
>>#vacuum_freeze_min_age = 50000000
>>#vacuum_freeze_table_age = 150000000
>>#vacuum_multixact_freeze_min_age = 5000000
>>#vacuum_multixact_freeze_table_age = 150000000
>>#bytea_output = 'hex'            # hex, escape
>>#xmlbinary = 'base64'
>>#xmloption = 'content'
>>#gin_fuzzy_search_limit = 0
>>#gin_pending_list_limit = 4MB
>>
>># - Locale and Formatting -
>>
>>datestyle = 'iso, mdy'
>>#intervalstyle = 'postgres'
>>timezone = 'UTC'
>>#timezone_abbreviations = 'Default'     # Select the set of available time zone
>>                    # abbreviations.  Currently, there are
>>                    #   Default
>>                    #   Australia (historical usage)
>>                    #   India
>>                    # You can create your own file in
>>                    # share/timezonesets/.
>>#extra_float_digits = 0            # min -15, max 3
>>#client_encoding = sql_ascii        # actually, defaults to database
>>                    # encoding
>>
>># These settings are initialized by initdb, but they can be changed.
>>lc_messages = 'en_US.UTF-8'            # locale for system error message
>>                    # strings
>>lc_monetary = 'en_US.UTF-8'            # locale for monetary formatting
>>lc_numeric = 'en_US.UTF-8'            # locale for number formatting
>>lc_time = 'en_US.UTF-8'                # locale for time formatting
>>
>># default configuration for text search
>>default_text_search_config = 'pg_catalog.english'
>>
>># - Other Defaults -
>>
>>#dynamic_library_path = '$libdir'
>>#local_preload_libraries = ''
>>#session_preload_libraries = ''
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># LOCK MANAGEMENT
>>#-------------------------------------------------------------------------
>>-----
>>
>>#deadlock_timeout = 1s
>>#max_locks_per_transaction = 64        # min 10
>>                    # (change requires restart)
>>#max_pred_locks_per_transaction = 64    # min 10
>>                    # (change requires restart)
>>#max_pred_locks_per_relation = -2    # negative values mean
>>                    # (max_pred_locks_per_transaction
>>                    #  / -max_pred_locks_per_relation) - 1
>>#max_pred_locks_per_page = 2            # min 0
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># VERSION/PLATFORM COMPATIBILITY
>>#-------------------------------------------------------------------------
>>-----
>>
>># - Previous PostgreSQL Versions -
>>
>>#array_nulls = on
>>#backslash_quote = safe_encoding    # on, off, or safe_encoding
>>#default_with_oids = off
>>#escape_string_warning = on
>>#lo_compat_privileges = off
>>#operator_precedence_warning = off
>>#quote_all_identifiers = off
>>#standard_conforming_strings = on
>>#synchronize_seqscans = on
>>
>># - Other Platforms and Clients -
>>
>>#transform_null_equals = off
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># ERROR HANDLING
>>#-------------------------------------------------------------------------
>>-----
>>
>>#exit_on_error = off            # terminate session on any error?
>>#restart_after_crash = on        # reinitialize after backend crash?
>>#data_sync_retry = off            # retry or panic on failure to fsync
>>                    # data?
>>                    # (change requires restart)
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># CONFIG FILE INCLUDES
>>#-------------------------------------------------------------------------
>>-----
>>
>># These options allow settings to be loaded from files other than the # default
>>postgresql.conf.
>>
>>#include_dir = ''            # include files ending in '.conf' from
>>                    # a directory, e.g., 'conf.d'
>>#include_if_exists = ''            # include file only if it exists
>>#include = ''                # include file
>>
>>
>>#-------------------------------------------------------------------------
>>-----
>># CUSTOMIZED OPTIONS
>>#-------------------------------------------------------------------------
>>-----
>>
>># Add settings for extensions here
>>
>>
>>BRs,
>>Fan Liu
>>ADP Document Database PG
>>
>>>>-----Original Message-----
>>>>From: Jaime Casanova <jaime.casanova@2ndquadrant.com>
>>>>Sent: 2020年3月27日 14:36
>>>>To: Fan Liu <fan.liu@ericsson.com>
>>>>Cc: Sergei Kornilov <sk@zsrv.org>; PostgreSQL mailing lists
>>>><pgsql-bugs@lists.postgresql.org>
>>>>Subject: Re: why wal_max_size does not work?
>>>>
>>>>On Fri, 27 Mar 2020 at 01:10, Fan Liu <fan.liu@ericsson.com> wrote:
>>>>>
>>>>> So, I wan to know under what kind of scenario that there will not be
>>>>> recycling
>>>>old WAL files.
>>>>> Is there any way I can check the recycling? For example, logs?
>>>>>
>>>>
>>>>please, i would like to see the contents of postgresql.base.conf',
>>>>maybe is changing a parameter that is not touched in postgresql.conf,
>>>>and postgresql.auto.conf for the same reason
>>>>
>>>>also, show us the output of: select * from pg_replication_slots if
>>>>there's any replication slot not connected to the server is
>>>>protecting, primary will keep the wals until the server comes back
>>>>
>>>>finally, while this seems not to be your case, a high
>>>>wal_keep_segments can cause this problem too
>>>>
>>>>--
>>>>Jaime Casanova                      www.2ndQuadrant.com
>>>>PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

Hi Jaime,

Our wal_keep_segments = '8' 

And I need update some finding from my side. 
We found that our program has a BUG, which some log files may not cleaned as expected. 
Those log files may not much, but day by day, it could possible to have a lot of logs. Then it's possible cause "no
spaceleft"
 

Base on the previous info
>>also, show us the output of: select * from pg_replication_slots if 
>>there's any replication slot not connected to the server is 
>>protecting, primary will keep the wals until the server comes back 

I have an assumption
1) log out of control, keep increasing 
2) one of the NODE met "no space left", become cycling restart. 
3) the Master NODE keep WAL files for that replica, waiting for replica up and sync data. 
4) rest of two NODE are full filled with WAL files.   

Could you help me with below question?
1) When replica NODE recovered and able to connect to primary, "max_wal_size" should start to be effective, right? 
2) Is there more scenario could cause WAL file not recycling? (except consider high traffic load in a short time)

BRs,
Fan Liu
ADP Document Database PG

>>-----Original Message-----
>>From: Fan Liu
>>Sent: 2020年3月31日 9:24
>>To: 'Jaime Casanova' <jaime.casanova@2ndquadrant.com>
>>Cc: 'Sergei Kornilov' <sk@zsrv.org>; 'PostgreSQL mailing lists'
>><pgsql-bugs@lists.postgresql.org>
>>Subject: RE: why wal_max_size does not work?
>>
>>Hello，
>>
>>Any update?
>>
>>I have another question.
>>Now I have recovered the NODE by deleted some old WAL files. But I still keep
>>the pg_wal folder around 2.4G.
>>Currently, all replicas are up and working. On the replica NODE, the WAL files
>>still keep and looks like will not be recycling.
>>So, is this an expected behavior?  Should I clean up those old WAL files? (e.g.
>>use pg_archivecleanup?)
>>
>>
>>BRs,
>>Fan Liu
>>ADP Document Database PG
>>
>>>>-----Original Message-----
>>>>From: Fan Liu
>>>>Sent: 2020年3月27日 15:12
>>>>To: Jaime Casanova <jaime.casanova@2ndquadrant.com>
>>>>Cc: Sergei Kornilov <sk@zsrv.org>; PostgreSQL mailing lists
>>>><pgsql-bugs@lists.postgresql.org>
>>>>Subject: RE: why wal_max_size does not work?
>>>>
>>>>Hello Jaime,
>>>>
>>>>Thanks for the supporting.
>>>>
>>>>>>also, show us the output of: select * from pg_replication_slots if
>>>>>>there's any replication slot not connected to the server is
>>>>>>protecting, primary will keep the wals until the server comes back
>>>>
>>>>One more question related with above scenario. If the replica NODE
>>>>fixed and reconnect to primary success after some time.
>>>>Then will the WAL be recycling?
>>>>
>>>>If I config archive, will this kind of issue be solved?
>>>>
>>>>
>>>>Just in case I will also provide the log you requested.
>>>>
>>>>postgres=# select * from pg_replication_slots;
>>>>      slot_name       | plugin | slot_type | datoid | database | temporary |
>>>>active | active_pid | xmin | catalog_xmin | restart_lsn |
>>>>confirmed_flush_lsn
>>>>----------------------+--------+-----------+--------+----------+------
>>>>----------------------+--------+-----------+--------+----------+----
>>>>-+--------+------------+------+--------------+-------------+----------
>>>>-+--------+------------+------+--------------+-------------+----
>>>>-------
>>>> eric_adp_ss7_db_pg_1 |        | physical  |        |          | f         | t
>>>>|      98153 |      |              | 0/9003A78   |
>>>> eric_adp_ss7_db_pg_2 |        | physical  |        |          | f         | t
>>>>|      98154 |      |              | 0/9003A78   |
>>>>(2 rows)
>>>>
>>>>postgres=#
>>>>
>>>>--------------- postgresql.base.conf --------------------------- cat
>>>>/var/lib/postgresql/data/pgdata/postgresql.base.conf
>>>># -----------------------------
>>>># PostgreSQL configuration file
>>>># -----------------------------
>>>>#
>>>># This file consists of lines of the form:
>>>>#
>>>>#   name = value
>>>>#
>>>># (The "=" is optional.)  Whitespace may be used.  Comments are
>>>>introduced with # "#" anywhere on a line.  The complete list of
>>>>parameter names and allowed # values can be found in the PostgreSQL
>>documentation.
>>>>#
>>>># The commented-out settings shown in this file represent the default values.
>>>># Re-commenting a setting is NOT sufficient to revert it to the
>>>>default value; # you need to reload the server.
>>>>#
>>>># This file is read on server startup and when the server receives a
>>>>SIGHUP # signal.  If you edit the file on a running system, you have
>>>>to SIGHUP the # server for the changes to take effect, run "pg_ctl
>>>>reload", or execute # "SELECT pg_reload_conf()".  Some parameters,
>>>>which are marked below, # require a server shutdown and restart to take effect.
>>>>#
>>>># Any parameter can also be given as a command-line option to the
>>>>server, e.g., # "postgres -c log_connections=on".  Some parameters can
>>>>be changed at run time # with the "SET" SQL command.
>>>>#
>>>># Memory units:  kB = kilobytes        Time units:  ms  = milliseconds
>>>>#                MB = megabytes                     s   = seconds
>>>>#                GB = gigabytes                     min = minutes
>>>>#                TB = terabytes                     h   = hours
>>>>#                                                   d   = days
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># FILE LOCATIONS
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># The default values of these variables are driven from the -D
>>>>command-line # option or PGDATA environment variable, represented here as
>>ConfigDir.
>>>>
>>>>#data_directory = 'ConfigDir'        # use data in another directory
>>>>                    # (change requires restart)
>>>>#hba_file = 'ConfigDir/pg_hba.conf'    # host-based authentication file
>>>>                    # (change requires restart)
>>>>#ident_file = 'ConfigDir/pg_ident.conf'    # ident configuration file
>>>>                    # (change requires restart)
>>>>
>>>># If external_pid_file is not explicitly set, no extra PID file is written.
>>>>#external_pid_file = ''            # write an extra PID file
>>>>                    # (change requires restart)
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># CONNECTIONS AND AUTHENTICATION
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># - Connection Settings -
>>>>
>>>>#listen_addresses = 'localhost'        # what IP address(es) to listen on;
>>>>                    # comma-separated list of addresses;
>>>>                    # defaults to 'localhost'; use '*' for all
>>>>                    # (change requires restart)
>>>>#port = 5432                # (change requires restart)
>>>>max_connections = 100            # (change requires restart)
>>>>#superuser_reserved_connections = 3    # (change requires restart)
>>>>#unix_socket_directories = '/var/run/postgresql, /tmp'    #
>>comma-separated
>>>>list of directories
>>>>                    # (change requires restart)
>>>>#unix_socket_group = ''            # (change requires restart)
>>>>#unix_socket_permissions = 0777        # begin with 0 to use octal notation
>>>>                    # (change requires restart)
>>>>#bonjour = off                # advertise server via Bonjour
>>>>                    # (change requires restart)
>>>>#bonjour_name = ''            # defaults to the computer name
>>>>                    # (change requires restart)
>>>>
>>>># - Security and Authentication -
>>>>
>>>>#authentication_timeout = 1min        # 1s-600s
>>>>#ssl = off
>>>>#ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed SSL ciphers
>>>>#ssl_prefer_server_ciphers = on #ssl_ecdh_curve = 'prime256v1'
>>>>#ssl_dh_params_file = ''
>>>>#ssl_cert_file = 'server.crt'
>>>>#ssl_key_file = 'server.key'
>>>>#ssl_ca_file = ''
>>>>#ssl_crl_file = ''
>>>>#password_encryption = md5        # md5 or scram-sha-256
>>>>#db_user_namespace = off
>>>>#row_security = on
>>>>
>>>># GSSAPI using Kerberos
>>>>#krb_server_keyfile = ''
>>>>#krb_caseins_users = off
>>>>
>>>># - TCP Keepalives -
>>>># see "man 7 tcp" for details
>>>>
>>>>#tcp_keepalives_idle = 0        # TCP_KEEPIDLE, in seconds;
>>>>                    # 0 selects the system default
>>>>#tcp_keepalives_interval = 0        # TCP_KEEPINTVL, in seconds;
>>>>                    # 0 selects the system default
>>>>#tcp_keepalives_count = 0        # TCP_KEEPCNT;
>>>>                    # 0 selects the system default
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># RESOURCE USAGE (except WAL)
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># - Memory -
>>>>
>>>>shared_buffers = 128MB            # min 128kB
>>>>                    # (change requires restart)
>>>>#huge_pages = try            # on, off, or try
>>>>                    # (change requires restart)
>>>>#temp_buffers = 8MB            # min 800kB
>>>>#max_prepared_transactions = 0        # zero disables the feature
>>>>                    # (change requires restart)
>>>># Caution: it is not advisable to set max_prepared_transactions
>>>>nonzero unless # you actively intend to use prepared transactions.
>>>>#work_mem = 4MB                # min 64kB
>>>>#maintenance_work_mem = 64MB        # min 1MB
>>>>#replacement_sort_tuples = 150000    # limits use of replacement selection
>>sort
>>>>#autovacuum_work_mem = -1        # min 1MB, or -1 to use maintenance_work_mem
>>>>#max_stack_depth = 2MB            # min 100kB
>>>>dynamic_shared_memory_type = posix    # the default is the first option
>>>>                    # supported by the operating system:
>>>>                    #   posix
>>>>                    #   sysv
>>>>                    #   windows
>>>>                    #   mmap
>>>>                    # use none to disable dynamic shared memory
>>>>                    # (change requires restart)
>>>>
>>>># - Disk -
>>>>
>>>>#temp_file_limit = -1            # limits per-process temp file space
>>>>                    # in kB, or -1 for no limit
>>>>
>>>># - Kernel Resource Usage -
>>>>
>>>>#max_files_per_process = 1000        # min 25
>>>>                    # (change requires restart)
>>>>#shared_preload_libraries = ''        # (change requires restart)
>>>>
>>>># - Cost-Based Vacuum Delay -
>>>>
>>>>#vacuum_cost_delay = 0            # 0-100 milliseconds
>>>>#vacuum_cost_page_hit = 1        # 0-10000 credits
>>>>#vacuum_cost_page_miss = 10        # 0-10000 credits
>>>>#vacuum_cost_page_dirty = 20        # 0-10000 credits
>>>>#vacuum_cost_limit = 200        # 1-10000 credits
>>>>
>>>># - Background Writer -
>>>>
>>>>#bgwriter_delay = 200ms            # 10-10000ms between rounds
>>>>#bgwriter_lru_maxpages = 100        # 0-1000 max buffers written/round
>>>>#bgwriter_lru_multiplier = 2.0        # 0-10.0 multiplier on buffers
>>>>scanned/round
>>>>#bgwriter_flush_after = 512kB        # measured in pages, 0 disables
>>>>
>>>># - Asynchronous Behavior -
>>>>
>>>>#effective_io_concurrency = 1        # 1-1000; 0 disables prefetching
>>>>#max_worker_processes = 8        # (change requires restart)
>>>>#max_parallel_workers_per_gather = 2    # taken from max_parallel_workers
>>>>#max_parallel_workers = 8        # maximum number of max_worker_processes
>>that
>>>>                    # can be used in parallel queries
>>>>#old_snapshot_threshold = -1        # 1min-60d; -1 disables; 0 is immediate
>>>>                    # (change requires restart)
>>>>#backend_flush_after = 0        # measured in pages, 0 disables
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># WRITE AHEAD LOG
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># - Settings -
>>>>
>>>>#wal_level = replica            # minimal, replica, or logical
>>>>                    # (change requires restart)
>>>>#fsync = on                # flush data to disk for crash safety
>>>>                    # (turning this off can cause
>>>>                    # unrecoverable data corruption)
>>>>#synchronous_commit = on        # synchronization level;
>>>>                    # off, local, remote_write, remote_apply, or on
>>>>#wal_sync_method = fsync        # the default is the first option
>>>>                    # supported by the operating system:
>>>>                    #   open_datasync
>>>>                    #   fdatasync (default on Linux)
>>>>                    #   fsync
>>>>                    #   fsync_writethrough
>>>>                    #   open_sync
>>>>#full_page_writes = on            # recover from partial page writes
>>>>#wal_compression = off            # enable compression of full-page writes
>>>>#wal_log_hints = off            # also do full page writes of non-critical
>>>>updates
>>>>                    # (change requires restart)
>>>>#wal_buffers = -1            # min 32kB, -1 sets based on shared_buffers
>>>>                    # (change requires restart)
>>>>#wal_writer_delay = 200ms        # 1-10000 milliseconds
>>>>#wal_writer_flush_after = 1MB        # measured in pages, 0 disables
>>>>
>>>>#commit_delay = 0            # range 0-100000, in microseconds
>>>>#commit_siblings = 5            # range 1-1000
>>>>
>>>># - Checkpoints -
>>>>
>>>>#checkpoint_timeout = 5min        # range 30s-1d
>>>>#max_wal_size = 1GB
>>>>#min_wal_size = 80MB
>>>>#checkpoint_completion_target = 0.5    # checkpoint target duration, 0.0 -
>>1.0
>>>>#checkpoint_flush_after = 256kB        # measured in pages, 0 disables
>>>>#checkpoint_warning = 30s        # 0 disables
>>>>
>>>># - Archiving -
>>>>
>>>>#archive_mode = off        # enables archiving; off, on, or always
>>>>                # (change requires restart)
>>>>#archive_command = ''        # command to use to archive a logfile segment
>>>>                # placeholders: %p = path of file to archive
>>>>                #               %f = file name only
>>>>                # e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p
>>>>/mnt/server/archivedir/%f'
>>>>#archive_timeout = 0        # force a logfile segment switch after this
>>>>                # number of seconds; 0 disables
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># REPLICATION
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># - Sending Server(s) -
>>>>
>>>># Set these on the master and on any standby that will send replication data.
>>>>
>>>>#max_wal_senders = 10        # max number of walsender processes
>>>>                # (change requires restart)
>>>>#wal_keep_segments = 0        # in logfile segments, 16MB each; 0 disables
>>>>#wal_sender_timeout = 60s    # in milliseconds; 0 disables
>>>>
>>>>#max_replication_slots = 10    # max number of replication slots
>>>>                # (change requires restart)
>>>>#track_commit_timestamp = off    # collect timestamp of transaction commit
>>>>                # (change requires restart)
>>>>
>>>># - Master Server -
>>>>
>>>># These settings are ignored on a standby server.
>>>>
>>>>#synchronous_standby_names = ''    # standby servers that provide sync rep
>>>>                # method to choose sync standbys, number of sync standbys,
>>>>                # and comma-separated list of application_name
>>>>                # from standby(s); '*' = all
>>>>#vacuum_defer_cleanup_age = 0    # number of xacts by which cleanup is delayed
>>>>
>>>># - Standby Servers -
>>>>
>>>># These settings are ignored on a master server.
>>>>
>>>>#hot_standby = on            # "off" disallows queries during recovery
>>>>                    # (change requires restart)
>>>>#max_standby_archive_delay = 30s    # max delay before canceling queries
>>>>                    # when reading WAL from archive;
>>>>                    # -1 allows indefinite delay
>>>>#max_standby_streaming_delay = 30s    # max delay before canceling queries
>>>>                    # when reading streaming WAL;
>>>>                    # -1 allows indefinite delay
>>>>#wal_receiver_status_interval = 10s    # send replies at least this often
>>>>                    # 0 disables
>>>>#hot_standby_feedback = off        # send info from standby to prevent
>>>>                    # query conflicts
>>>>#wal_receiver_timeout = 60s        # time that receiver waits for
>>>>                    # communication from master
>>>>                    # in milliseconds; 0 disables
>>>>#wal_retrieve_retry_interval = 5s    # time to wait before retrying to
>>>>                    # retrieve WAL after a failed attempt
>>>>
>>>># - Subscribers -
>>>>
>>>># These settings are ignored on a publisher.
>>>>
>>>>#max_logical_replication_workers = 4    # taken from max_worker_processes
>>>>                    # (change requires restart)
>>>>#max_sync_workers_per_subscription = 2    # taken from
>>>>max_logical_replication_workers
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># QUERY TUNING
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># - Planner Method Configuration -
>>>>
>>>>#enable_bitmapscan = on
>>>>#enable_hashagg = on
>>>>#enable_hashjoin = on
>>>>#enable_indexscan = on
>>>>#enable_indexonlyscan = on
>>>>#enable_material = on
>>>>#enable_mergejoin = on
>>>>#enable_nestloop = on
>>>>#enable_seqscan = on
>>>>#enable_sort = on
>>>>#enable_tidscan = on
>>>>
>>>># - Planner Cost Constants -
>>>>
>>>>#seq_page_cost = 1.0            # measured on an arbitrary scale
>>>>#random_page_cost = 4.0            # same scale as above
>>>>#cpu_tuple_cost = 0.01            # same scale as above
>>>>#cpu_index_tuple_cost = 0.005        # same scale as above
>>>>#cpu_operator_cost = 0.0025        # same scale as above
>>>>#parallel_tuple_cost = 0.1        # same scale as above
>>>>#parallel_setup_cost = 1000.0    # same scale as above
>>>>#min_parallel_table_scan_size = 8MB
>>>>#min_parallel_index_scan_size = 512kB
>>>>#effective_cache_size = 4GB
>>>>
>>>># - Genetic Query Optimizer -
>>>>
>>>>#geqo = on
>>>>#geqo_threshold = 12
>>>>#geqo_effort = 5            # range 1-10
>>>>#geqo_pool_size = 0            # selects default based on effort
>>>>#geqo_generations = 0            # selects default based on effort
>>>>#geqo_selection_bias = 2.0        # range 1.5-2.0
>>>>#geqo_seed = 0.0            # range 0.0-1.0
>>>>
>>>># - Other Planner Options -
>>>>
>>>>#default_statistics_target = 100    # range 1-10000
>>>>#constraint_exclusion = partition    # on, off, or partition
>>>>#cursor_tuple_fraction = 0.1        # range 0.0-1.0
>>>>#from_collapse_limit = 8
>>>>#join_collapse_limit = 8        # 1 disables collapsing of explicit
>>>>                    # JOIN clauses
>>>>#force_parallel_mode = off
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># ERROR REPORTING AND LOGGING
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># - Where to Log -
>>>>
>>>>log_destination = 'stderr'        # Valid values are combinations of
>>>>                    # stderr, csvlog, syslog, and eventlog,
>>>>                    # depending on platform.  csvlog
>>>>                    # requires logging_collector to be on.
>>>>
>>>># This is used when logging to stderr:
>>>>logging_collector = on            # Enable capturing of stderr and csvlog
>>>>                    # into log files. Required to be on for
>>>>                    # csvlogs.
>>>>                    # (change requires restart)
>>>>
>>>># These are only used if logging_collector is on:
>>>>#log_directory = 'log'            # directory where log files are written,
>>>>                    # can be absolute or relative to PGDATA
>>>>#log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'    # log file name pattern,
>>>>                    # can include strftime() escapes
>>>>#log_file_mode = 0600            # creation mode for log files,
>>>>                    # begin with 0 to use octal notation
>>>>#log_truncate_on_rotation = off        # If on, an existing log file with the
>>>>                    # same name as the new log file will be
>>>>                    # truncated rather than appended to.
>>>>                    # But such truncation only occurs on
>>>>                    # time-driven rotation, not on restarts
>>>>                    # or size-driven rotation.  Default is
>>>>                    # off, meaning append to existing files
>>>>                    # in all cases.
>>>>#log_rotation_age = 1d            # Automatic rotation of logfiles will
>>>>                    # happen after that time.  0 disables.
>>>>#log_rotation_size = 10MB        # Automatic rotation of logfiles will
>>>>                    # happen after that much log output.
>>>>                    # 0 disables.
>>>>
>>>># These are relevant when logging to syslog:
>>>>#syslog_facility = 'LOCAL0'
>>>>#syslog_ident = 'postgres'
>>>>#syslog_sequence_numbers = on
>>>>#syslog_split_messages = on
>>>>
>>>># This is only relevant when logging to eventlog (win32):
>>>># (change requires restart)
>>>>#event_source = 'PostgreSQL'
>>>>
>>>># - When to Log -
>>>>
>>>>#log_min_messages = warning        # values in order of decreasing detail:
>>>>                    #   debug5
>>>>                    #   debug4
>>>>                    #   debug3
>>>>                    #   debug2
>>>>                    #   debug1
>>>>                    #   info
>>>>                    #   notice
>>>>                    #   warning
>>>>                    #   error
>>>>                    #   log
>>>>                    #   fatal
>>>>                    #   panic
>>>>
>>>>#log_min_error_statement = error    # values in order of decreasing detail:
>>>>                    #   debug5
>>>>                    #   debug4
>>>>                    #   debug3
>>>>                    #   debug2
>>>>                    #   debug1
>>>>                    #   info
>>>>                    #   notice
>>>>                    #   warning
>>>>                    #   error
>>>>                    #   log
>>>>                    #   fatal
>>>>                    #   panic (effectively off)
>>>>
>>>>#log_min_duration_statement = -1    # -1 is disabled, 0 logs all statements
>>>>                    # and their durations, > 0 logs only
>>>>                    # statements running at least this number
>>>>                    # of milliseconds
>>>>
>>>>
>>>># - What to Log -
>>>>
>>>>#debug_print_parse = off
>>>>#debug_print_rewritten = off
>>>>#debug_print_plan = off
>>>>#debug_pretty_print = on
>>>>#log_checkpoints = off
>>>>#log_connections = off
>>>>#log_disconnections = off
>>>>#log_duration = off
>>>>#log_error_verbosity = default        # terse, default, or verbose messages
>>>>#log_hostname = off
>>>>#log_line_prefix = '%m [%p] '        # special values:
>>>>log_line_prefix = '%m %d %u [%p]'
>>>>                    #   %a = application name
>>>>                    #   %u = user name
>>>>                    #   %d = database name
>>>>                    #   %r = remote host and port
>>>>                    #   %h = remote host
>>>>                    #   %p = process ID
>>>>                    #   %t = timestamp without milliseconds
>>>>                    #   %m = timestamp with milliseconds
>>>>                    #   %n = timestamp with milliseconds (as a Unix epoch)
>>>>                    #   %i = command tag
>>>>                    #   %e = SQL state
>>>>                    #   %c = session ID
>>>>                    #   %l = session line number
>>>>                    #   %s = session start timestamp
>>>>                    #   %v = virtual transaction ID
>>>>                    #   %x = transaction ID (0 if none)
>>>>                    #   %q = stop here in non-session
>>>>                    #        processes
>>>>                    #   %% = '%'
>>>>                    # e.g. '<%u%%%d> '
>>>>#log_lock_waits = off            # log lock waits >= deadlock_timeout
>>>>#log_statement = 'none'            # none, ddl, mod, all
>>>>#log_replication_commands = off
>>>>#log_temp_files = -1            # log temporary files equal or larger
>>>>                    # than the specified size in kilobytes;
>>>>                    # -1 disables, 0 logs all temp files log_timezone = 'UTC'
>>>>
>>>>
>>>># - Process Title -
>>>>
>>>>#cluster_name = ''            # added to process titles if nonempty
>>>>                    # (change requires restart)
>>>>#update_process_title = on
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># RUNTIME STATISTICS
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># - Query/Index Statistics Collector -
>>>>
>>>>#track_activities = on
>>>>#track_counts = on
>>>>#track_io_timing = off
>>>>#track_functions = none            # none, pl, all
>>>>#track_activity_query_size = 1024    # (change requires restart)
>>>>#stats_temp_directory = 'pg_stat_tmp'
>>>>
>>>>
>>>># - Statistics Monitoring -
>>>>
>>>>#log_parser_stats = off
>>>>#log_planner_stats = off
>>>>#log_executor_stats = off
>>>>#log_statement_stats = off
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># AUTOVACUUM PARAMETERS
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>>#autovacuum = on            # Enable autovacuum subprocess?  'on'
>>>>                    # requires track_counts to also be on.
>>>>#log_autovacuum_min_duration = -1    # -1 disables, 0 logs all actions and
>>>>                    # their durations, > 0 logs only
>>>>                    # actions running at least this number
>>>>                    # of milliseconds.
>>>>#autovacuum_max_workers = 3        # max number of autovacuum subprocesses
>>>>                    # (change requires restart)
>>>>#autovacuum_naptime = 1min        # time between autovacuum runs
>>>>#autovacuum_vacuum_threshold = 50    # min number of row updates before
>>>>                    # vacuum
>>>>#autovacuum_analyze_threshold = 50    # min number of row updates before
>>>>                    # analyze
>>>>#autovacuum_vacuum_scale_factor = 0.2    # fraction of table size before
>>>>vacuum
>>>>#autovacuum_analyze_scale_factor = 0.1    # fraction of table size before
>>>>analyze
>>>>#autovacuum_freeze_max_age = 200000000    # maximum XID age before forced
>>>>vacuum
>>>>                    # (change requires restart)
>>>>#autovacuum_multixact_freeze_max_age = 400000000    # maximum multixact age
>>>>                    # before forced vacuum
>>>>                    # (change requires restart)
>>>>#autovacuum_vacuum_cost_delay = 20ms    # default vacuum cost delay for
>>>>                    # autovacuum, in milliseconds;
>>>>                    # -1 means use vacuum_cost_delay
>>>>#autovacuum_vacuum_cost_limit = -1    # default vacuum cost limit for
>>>>                    # autovacuum, -1 means use
>>>>                    # vacuum_cost_limit
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># CLIENT CONNECTION DEFAULTS
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># - Statement Behavior -
>>>>
>>>>#client_min_messages = notice        # values in order of decreasing detail:
>>>>                    #   debug5
>>>>                    #   debug4
>>>>                    #   debug3
>>>>                    #   debug2
>>>>                    #   debug1
>>>>                    #   log
>>>>                    #   notice
>>>>                    #   warning
>>>>                    #   error
>>>>#search_path = '"$user", public'    # schema names
>>>>#default_tablespace = ''        # a tablespace name, '' uses the default
>>>>#temp_tablespaces = ''            # a list of tablespace names, '' uses
>>>>                    # only default tablespace
>>>>#check_function_bodies = on
>>>>#default_transaction_isolation = 'read committed'
>>>>#default_transaction_read_only = off
>>>>#default_transaction_deferrable = off
>>>>#session_replication_role = 'origin'
>>>>#statement_timeout = 0            # in milliseconds, 0 is disabled
>>>>#lock_timeout = 0            # in milliseconds, 0 is disabled
>>>>#idle_in_transaction_session_timeout = 0    # in milliseconds, 0 is disabled
>>>>#vacuum_freeze_min_age = 50000000
>>>>#vacuum_freeze_table_age = 150000000
>>>>#vacuum_multixact_freeze_min_age = 5000000
>>>>#vacuum_multixact_freeze_table_age = 150000000
>>>>#bytea_output = 'hex'            # hex, escape
>>>>#xmlbinary = 'base64'
>>>>#xmloption = 'content'
>>>>#gin_fuzzy_search_limit = 0
>>>>#gin_pending_list_limit = 4MB
>>>>
>>>># - Locale and Formatting -
>>>>
>>>>datestyle = 'iso, mdy'
>>>>#intervalstyle = 'postgres'
>>>>timezone = 'UTC'
>>>>#timezone_abbreviations = 'Default'     # Select the set of available time
>>zone
>>>>                    # abbreviations.  Currently, there are
>>>>                    #   Default
>>>>                    #   Australia (historical usage)
>>>>                    #   India
>>>>                    # You can create your own file in
>>>>                    # share/timezonesets/.
>>>>#extra_float_digits = 0            # min -15, max 3
>>>>#client_encoding = sql_ascii        # actually, defaults to database
>>>>                    # encoding
>>>>
>>>># These settings are initialized by initdb, but they can be changed.
>>>>lc_messages = 'en_US.UTF-8'            # locale for system error message
>>>>                    # strings
>>>>lc_monetary = 'en_US.UTF-8'            # locale for monetary formatting
>>>>lc_numeric = 'en_US.UTF-8'            # locale for number formatting
>>>>lc_time = 'en_US.UTF-8'                # locale for time formatting
>>>>
>>>># default configuration for text search default_text_search_config =
>>>>'pg_catalog.english'
>>>>
>>>># - Other Defaults -
>>>>
>>>>#dynamic_library_path = '$libdir'
>>>>#local_preload_libraries = ''
>>>>#session_preload_libraries = ''
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># LOCK MANAGEMENT
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>>#deadlock_timeout = 1s
>>>>#max_locks_per_transaction = 64        # min 10
>>>>                    # (change requires restart)
>>>>#max_pred_locks_per_transaction = 64    # min 10
>>>>                    # (change requires restart)
>>>>#max_pred_locks_per_relation = -2    # negative values mean
>>>>                    # (max_pred_locks_per_transaction
>>>>                    #  / -max_pred_locks_per_relation) - 1
>>>>#max_pred_locks_per_page = 2            # min 0
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># VERSION/PLATFORM COMPATIBILITY
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># - Previous PostgreSQL Versions -
>>>>
>>>>#array_nulls = on
>>>>#backslash_quote = safe_encoding    # on, off, or safe_encoding
>>>>#default_with_oids = off
>>>>#escape_string_warning = on
>>>>#lo_compat_privileges = off
>>>>#operator_precedence_warning = off
>>>>#quote_all_identifiers = off
>>>>#standard_conforming_strings = on
>>>>#synchronize_seqscans = on
>>>>
>>>># - Other Platforms and Clients -
>>>>
>>>>#transform_null_equals = off
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># ERROR HANDLING
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>>#exit_on_error = off            # terminate session on any error?
>>>>#restart_after_crash = on        # reinitialize after backend crash?
>>>>#data_sync_retry = off            # retry or panic on failure to fsync
>>>>                    # data?
>>>>                    # (change requires restart)
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># CONFIG FILE INCLUDES
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># These options allow settings to be loaded from files other than the
>>>># default postgresql.conf.
>>>>
>>>>#include_dir = ''            # include files ending in '.conf' from
>>>>                    # a directory, e.g., 'conf.d'
>>>>#include_if_exists = ''            # include file only if it exists
>>>>#include = ''                # include file
>>>>
>>>>
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>># CUSTOMIZED OPTIONS
>>>>#---------------------------------------------------------------------
>>>>----
>>>>-----
>>>>
>>>># Add settings for extensions here
>>>>
>>>>
>>>>BRs,
>>>>Fan Liu
>>>>ADP Document Database PG
>>>>
>>>>>>-----Original Message-----
>>>>>>From: Jaime Casanova <jaime.casanova@2ndquadrant.com>
>>>>>>Sent: 2020年3月27日 14:36
>>>>>>To: Fan Liu <fan.liu@ericsson.com>
>>>>>>Cc: Sergei Kornilov <sk@zsrv.org>; PostgreSQL mailing lists
>>>>>><pgsql-bugs@lists.postgresql.org>
>>>>>>Subject: Re: why wal_max_size does not work?
>>>>>>
>>>>>>On Fri, 27 Mar 2020 at 01:10, Fan Liu <fan.liu@ericsson.com> wrote:
>>>>>>>
>>>>>>> So, I wan to know under what kind of scenario that there will not
>>>>>>> be recycling
>>>>>>old WAL files.
>>>>>>> Is there any way I can check the recycling? For example, logs?
>>>>>>>
>>>>>>
>>>>>>please, i would like to see the contents of postgresql.base.conf',
>>>>>>maybe is changing a parameter that is not touched in
>>>>>>postgresql.conf, and postgresql.auto.conf for the same reason
>>>>>>
>>>>>>also, show us the output of: select * from pg_replication_slots if
>>>>>>there's any replication slot not connected to the server is
>>>>>>protecting, primary will keep the wals until the server comes back
>>>>>>
>>>>>>finally, while this seems not to be your case, a high
>>>>>>wal_keep_segments can cause this problem too
>>>>>>
>>>>>>--
>>>>>>Jaime Casanova                      www.2ndQuadrant.com
>>>>>>PostgreSQL Development, 24x7 Support, Remote DBA, Training &
>>>>>>Services

Update:
This issue happens again. We really hope someone from PostgreSQL development could provide some suggestion. At least
someworkaround could avid issue like this.  
 

---------- LOG on replica NODE/POD--------------
postgres=# select pg_walfile_name( pg_current_wal_lsn());
ERROR:  recovery is in progress
HINT:  WAL control functions cannot be executed during recovery.


postgres=# SHOW max_wal_size;
 max_wal_size
--------------
 1GB
(1 row)

postgres=# show archive_mode;
 archive_mode
--------------
 off
(1 row)

postgres=# show archive_command;
 archive_command
-----------------
 (disabled)
(1 row)

postgres=# select * from pg_stat_replication;
 pid | usesysid | usename | application_name | client_addr | client_hostname | client_port | backend_start |
backend_xmin| state | sent_lsn | write_lsn | flush_lsn | replay_lsn | write_lag | flush_lag | replay_lag | sync_pr
 
iority | sync_state

-----+----------+---------+------------------+-------------+-----------------+-------------+---------------+--------------+-------+----------+-----------+-----------+------------+-----------+-----------+------------+--------
-------+------------
(0 rows)

postgres=# select * from pg_replication_slots;
 slot_name | plugin | slot_type | datoid | database | temporary | active | active_pid | xmin | catalog_xmin |
restart_lsn| confirmed_flush_lsn
 

-----------+--------+-----------+--------+----------+-----------+--------+------------+------+--------------+-------------+---------------------
(0 rows)

---------------- LOG on primary NODE/POD  ------------
postgres=# select pg_walfile_name( pg_current_wal_lsn());
     pg_walfile_name
--------------------------
 000001310000000000000009
(1 row)

postgres=# select * from pg_stat_replication;
  pid  | usesysid | usename |   application_name   |   client_addr   | client_hostname | client_port |
backend_start        | backend_xmin |   state   | sent_lsn  | write_lsn | flush_lsn | replay_lsn | write_lag | f
 
lush_lag | replay_lag | sync_priority | sync_state

-------+----------+---------+----------------------+-----------------+-----------------+-------------+-------------------------------+--------------+-----------+-----------+-----------+-----------+------------+-----------+--
---------+------------+---------------+------------
 85707 |    16398 | replica | eric-adp-ss7-db-pg-1 | 192.168.127.167 |                 |       37592 | 2020-04-09
01:19:30.895663+00|              | streaming | 0/9030318 | 0/9030318 | 0/9030318 | 0/9030318  |           |
 
         |            |             1 | sync
 85708 |    16398 | replica | eric-adp-ss7-db-pg-0 | 192.168.186.103 |                 |       40294 | 2020-04-09
01:19:30.895917+00|              | streaming | 0/9030318 | 0/9030318 | 0/9030318 | 0/9030318  |           |
 
         |            |             0 | async
(2 rows)

postgres=# select * from pg_replication_slots;
      slot_name       | plugin | slot_type | datoid | database | temporary | active | active_pid | xmin | catalog_xmin
|restart_lsn | confirmed_flush_lsn
 

----------------------+--------+-----------+--------+----------+-----------+--------+------------+------+--------------+-------------+---------------------
 eric_adp_ss7_db_pg_1 |        | physical  |        |          | f         | t      |      85707 |      |
|0/9030318   |
 
 eric_adp_ss7_db_pg_0 |        | physical  |        |          | f         | t      |      85708 |      |
|0/9030318   |
 
(2 rows)

postgres=#


postgres=# SHOW max_wal_size;
 max_wal_size
--------------
 1GB
(1 row)

eric-adp-ss7-db-pg-2:/var/lib/postgresql/data/pgdata/pg_wal # du -h .
16K     ./archive_status
3.3G    .

BRs,
Fan Liu
ADP Document Database PG

>>-----Original Message-----
>>From: Fan Liu
>>Sent: 2020年4月1日 14:51
>>To: 'Jaime Casanova' <jaime.casanova@2ndquadrant.com>
>>Cc: 'Sergei Kornilov' <sk@zsrv.org>; 'PostgreSQL mailing lists'
>><pgsql-bugs@lists.postgresql.org>
>>Subject: RE: why wal_max_size does not work?
>>
>>Hi Jaime,
>>
>>Our wal_keep_segments = '8'
>>
>>And I need update some finding from my side.
>>We found that our program has a BUG, which some log files may not cleaned as
>>expected.
>>Those log files may not much, but day by day, it could possible to have a lot
>>of logs. Then it's possible cause "no space left"
>>
>>Base on the previous info
>>>>also, show us the output of: select * from pg_replication_slots if
>>>>there's any replication slot not connected to the server is
>>>>protecting, primary will keep the wals until the server comes back
>>
>>I have an assumption
>>1) log out of control, keep increasing
>>2) one of the NODE met "no space left", become cycling restart.
>>3) the Master NODE keep WAL files for that replica, waiting for replica up and
>>sync data.
>>4) rest of two NODE are full filled with WAL files.
>>
>>Could you help me with below question?
>>1) When replica NODE recovered and able to connect to primary, "max_wal_size"
>>should start to be effective, right?
>>2) Is there more scenario could cause WAL file not recycling? (except consider
>>high traffic load in a short time)
>>
>>BRs,
>>Fan Liu
>>ADP Document Database PG
>>
>>>>-----Original Message-----
>>>>From: Fan Liu
>>>>Sent: 2020年3月31日 9:24
>>>>To: 'Jaime Casanova' <jaime.casanova@2ndquadrant.com>
>>>>Cc: 'Sergei Kornilov' <sk@zsrv.org>; 'PostgreSQL mailing lists'
>>>><pgsql-bugs@lists.postgresql.org>
>>>>Subject: RE: why wal_max_size does not work?
>>>>
>>>>Hello，
>>>>
>>>>Any update?
>>>>
>>>>I have another question.
>>>>Now I have recovered the NODE by deleted some old WAL files. But I
>>>>still keep the pg_wal folder around 2.4G.
>>>>Currently, all replicas are up and working. On the replica NODE, the
>>>>WAL files still keep and looks like will not be recycling.
>>>>So, is this an expected behavior?  Should I clean up those old WAL files? (e.g.
>>>>use pg_archivecleanup?)
>>>>
>>>>
>>>>BRs,
>>>>Fan Liu
>>>>ADP Document Database PG
>>>>
>>>>>>-----Original Message-----
>>>>>>From: Fan Liu
>>>>>>Sent: 2020年3月27日 15:12
>>>>>>To: Jaime Casanova <jaime.casanova@2ndquadrant.com>
>>>>>>Cc: Sergei Kornilov <sk@zsrv.org>; PostgreSQL mailing lists
>>>>>><pgsql-bugs@lists.postgresql.org>
>>>>>>Subject: RE: why wal_max_size does not work?
>>>>>>
>>>>>>Hello Jaime,
>>>>>>
>>>>>>Thanks for the supporting.
>>>>>>
>>>>>>>>also, show us the output of: select * from pg_replication_slots if
>>>>>>>>there's any replication slot not connected to the server is
>>>>>>>>protecting, primary will keep the wals until the server comes back
>>>>>>
>>>>>>One more question related with above scenario. If the replica NODE
>>>>>>fixed and reconnect to primary success after some time.
>>>>>>Then will the WAL be recycling?
>>>>>>
>>>>>>If I config archive, will this kind of issue be solved?
>>>>>>
>>>>>>
>>>>>>Just in case I will also provide the log you requested.
>>>>>>
>>>>>>postgres=# select * from pg_replication_slots;
>>>>>>      slot_name       | plugin | slot_type | datoid | database | temporary
>>|
>>>>>>active | active_pid | xmin | catalog_xmin | restart_lsn |
>>>>>>confirmed_flush_lsn
>>>>>>----------------------+--------+-----------+--------+----------+----
>>>>>>----------------------+--------+-----------+--------+----------+--
>>>>>>----------------------+--------+-----------+--------+----------+----
>>>>>>-+--------+------------+------+--------------+-------------+--------
>>>>>>-+--------+------------+------+--------------+-------------+--
>>>>>>-+--------+------------+------+--------------+-------------+----
>>>>>>-------
>>>>>> eric_adp_ss7_db_pg_1 |        | physical  |        |          | f         |
>>t
>>>>>>|      98153 |      |              | 0/9003A78   |
>>>>>> eric_adp_ss7_db_pg_2 |        | physical  |        |          | f         |
>>t
>>>>>>|      98154 |      |              | 0/9003A78   |
>>>>>>(2 rows)
>>>>>>
>>>>>>postgres=#
>>>>>>
>>>>>>--------------- postgresql.base.conf --------------------------- cat
>>>>>>/var/lib/postgresql/data/pgdata/postgresql.base.conf
>>>>>># -----------------------------
>>>>>># PostgreSQL configuration file
>>>>>># -----------------------------
>>>>>>#
>>>>>># This file consists of lines of the form:
>>>>>>#
>>>>>>#   name = value
>>>>>>#
>>>>>># (The "=" is optional.)  Whitespace may be used.  Comments are
>>>>>>introduced with # "#" anywhere on a line.  The complete list of
>>>>>>parameter names and allowed # values can be found in the PostgreSQL
>>>>documentation.
>>>>>>#
>>>>>># The commented-out settings shown in this file represent the default values.
>>>>>># Re-commenting a setting is NOT sufficient to revert it to the
>>>>>>default value; # you need to reload the server.
>>>>>>#
>>>>>># This file is read on server startup and when the server receives a
>>>>>>SIGHUP # signal.  If you edit the file on a running system, you have
>>>>>>to SIGHUP the # server for the changes to take effect, run "pg_ctl
>>>>>>reload", or execute # "SELECT pg_reload_conf()".  Some parameters,
>>>>>>which are marked below, # require a server shutdown and restart to take
>>effect.
>>>>>>#
>>>>>># Any parameter can also be given as a command-line option to the
>>>>>>server, e.g., # "postgres -c log_connections=on".  Some parameters
>>>>>>can be changed at run time # with the "SET" SQL command.
>>>>>>#
>>>>>># Memory units:  kB = kilobytes        Time units:  ms  = milliseconds
>>>>>>#                MB = megabytes                     s   = seconds
>>>>>>#                GB = gigabytes                     min = minutes
>>>>>>#                TB = terabytes                     h   = hours
>>>>>>#                                                   d   = days
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># FILE LOCATIONS
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># The default values of these variables are driven from the -D
>>>>>>command-line # option or PGDATA environment variable, represented
>>>>>>here as
>>>>ConfigDir.
>>>>>>
>>>>>>#data_directory = 'ConfigDir'        # use data in another directory
>>>>>>                    # (change requires restart)
>>>>>>#hba_file = 'ConfigDir/pg_hba.conf'    # host-based authentication file
>>>>>>                    # (change requires restart)
>>>>>>#ident_file = 'ConfigDir/pg_ident.conf'    # ident configuration file
>>>>>>                    # (change requires restart)
>>>>>>
>>>>>># If external_pid_file is not explicitly set, no extra PID file is written.
>>>>>>#external_pid_file = ''            # write an extra PID file
>>>>>>                    # (change requires restart)
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># CONNECTIONS AND AUTHENTICATION
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># - Connection Settings -
>>>>>>
>>>>>>#listen_addresses = 'localhost'        # what IP address(es) to listen on;
>>>>>>                    # comma-separated list of addresses;
>>>>>>                    # defaults to 'localhost'; use '*' for all
>>>>>>                    # (change requires restart)
>>>>>>#port = 5432                # (change requires restart)
>>>>>>max_connections = 100            # (change requires restart)
>>>>>>#superuser_reserved_connections = 3    # (change requires restart)
>>>>>>#unix_socket_directories = '/var/run/postgresql, /tmp'    #
>>>>comma-separated
>>>>>>list of directories
>>>>>>                    # (change requires restart)
>>>>>>#unix_socket_group = ''            # (change requires restart)
>>>>>>#unix_socket_permissions = 0777        # begin with 0 to use octal notation
>>>>>>                    # (change requires restart)
>>>>>>#bonjour = off                # advertise server via Bonjour
>>>>>>                    # (change requires restart)
>>>>>>#bonjour_name = ''            # defaults to the computer name
>>>>>>                    # (change requires restart)
>>>>>>
>>>>>># - Security and Authentication -
>>>>>>
>>>>>>#authentication_timeout = 1min        # 1s-600s
>>>>>>#ssl = off
>>>>>>#ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed SSL ciphers
>>>>>>#ssl_prefer_server_ciphers = on #ssl_ecdh_curve = 'prime256v1'
>>>>>>#ssl_dh_params_file = ''
>>>>>>#ssl_cert_file = 'server.crt'
>>>>>>#ssl_key_file = 'server.key'
>>>>>>#ssl_ca_file = ''
>>>>>>#ssl_crl_file = ''
>>>>>>#password_encryption = md5        # md5 or scram-sha-256
>>>>>>#db_user_namespace = off
>>>>>>#row_security = on
>>>>>>
>>>>>># GSSAPI using Kerberos
>>>>>>#krb_server_keyfile = ''
>>>>>>#krb_caseins_users = off
>>>>>>
>>>>>># - TCP Keepalives -
>>>>>># see "man 7 tcp" for details
>>>>>>
>>>>>>#tcp_keepalives_idle = 0        # TCP_KEEPIDLE, in seconds;
>>>>>>                    # 0 selects the system default
>>>>>>#tcp_keepalives_interval = 0        # TCP_KEEPINTVL, in seconds;
>>>>>>                    # 0 selects the system default
>>>>>>#tcp_keepalives_count = 0        # TCP_KEEPCNT;
>>>>>>                    # 0 selects the system default
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># RESOURCE USAGE (except WAL)
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># - Memory -
>>>>>>
>>>>>>shared_buffers = 128MB            # min 128kB
>>>>>>                    # (change requires restart)
>>>>>>#huge_pages = try            # on, off, or try
>>>>>>                    # (change requires restart)
>>>>>>#temp_buffers = 8MB            # min 800kB
>>>>>>#max_prepared_transactions = 0        # zero disables the feature
>>>>>>                    # (change requires restart)
>>>>>># Caution: it is not advisable to set max_prepared_transactions
>>>>>>nonzero unless # you actively intend to use prepared transactions.
>>>>>>#work_mem = 4MB                # min 64kB
>>>>>>#maintenance_work_mem = 64MB        # min 1MB
>>>>>>#replacement_sort_tuples = 150000    # limits use of replacement selection
>>>>sort
>>>>>>#autovacuum_work_mem = -1        # min 1MB, or -1 to use maintenance_work_mem
>>>>>>#max_stack_depth = 2MB            # min 100kB
>>>>>>dynamic_shared_memory_type = posix    # the default is the first option
>>>>>>                    # supported by the operating system:
>>>>>>                    #   posix
>>>>>>                    #   sysv
>>>>>>                    #   windows
>>>>>>                    #   mmap
>>>>>>                    # use none to disable dynamic shared memory
>>>>>>                    # (change requires restart)
>>>>>>
>>>>>># - Disk -
>>>>>>
>>>>>>#temp_file_limit = -1            # limits per-process temp file space
>>>>>>                    # in kB, or -1 for no limit
>>>>>>
>>>>>># - Kernel Resource Usage -
>>>>>>
>>>>>>#max_files_per_process = 1000        # min 25
>>>>>>                    # (change requires restart)
>>>>>>#shared_preload_libraries = ''        # (change requires restart)
>>>>>>
>>>>>># - Cost-Based Vacuum Delay -
>>>>>>
>>>>>>#vacuum_cost_delay = 0            # 0-100 milliseconds
>>>>>>#vacuum_cost_page_hit = 1        # 0-10000 credits
>>>>>>#vacuum_cost_page_miss = 10        # 0-10000 credits
>>>>>>#vacuum_cost_page_dirty = 20        # 0-10000 credits
>>>>>>#vacuum_cost_limit = 200        # 1-10000 credits
>>>>>>
>>>>>># - Background Writer -
>>>>>>
>>>>>>#bgwriter_delay = 200ms            # 10-10000ms between rounds
>>>>>>#bgwriter_lru_maxpages = 100        # 0-1000 max buffers written/round
>>>>>>#bgwriter_lru_multiplier = 2.0        # 0-10.0 multiplier on buffers
>>>>>>scanned/round
>>>>>>#bgwriter_flush_after = 512kB        # measured in pages, 0 disables
>>>>>>
>>>>>># - Asynchronous Behavior -
>>>>>>
>>>>>>#effective_io_concurrency = 1        # 1-1000; 0 disables prefetching
>>>>>>#max_worker_processes = 8        # (change requires restart)
>>>>>>#max_parallel_workers_per_gather = 2    # taken from max_parallel_workers
>>>>>>#max_parallel_workers = 8        # maximum number of max_worker_processes
>>>>that
>>>>>>                    # can be used in parallel queries
>>>>>>#old_snapshot_threshold = -1        # 1min-60d; -1 disables; 0 is immediate
>>>>>>                    # (change requires restart)
>>>>>>#backend_flush_after = 0        # measured in pages, 0 disables
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># WRITE AHEAD LOG
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># - Settings -
>>>>>>
>>>>>>#wal_level = replica            # minimal, replica, or logical
>>>>>>                    # (change requires restart)
>>>>>>#fsync = on                # flush data to disk for crash safety
>>>>>>                    # (turning this off can cause
>>>>>>                    # unrecoverable data corruption)
>>>>>>#synchronous_commit = on        # synchronization level;
>>>>>>                    # off, local, remote_write, remote_apply, or on
>>>>>>#wal_sync_method = fsync        # the default is the first option
>>>>>>                    # supported by the operating system:
>>>>>>                    #   open_datasync
>>>>>>                    #   fdatasync (default on Linux)
>>>>>>                    #   fsync
>>>>>>                    #   fsync_writethrough
>>>>>>                    #   open_sync
>>>>>>#full_page_writes = on            # recover from partial page writes
>>>>>>#wal_compression = off            # enable compression of full-page writes
>>>>>>#wal_log_hints = off            # also do full page writes of non-critical
>>>>>>updates
>>>>>>                    # (change requires restart)
>>>>>>#wal_buffers = -1            # min 32kB, -1 sets based on shared_buffers
>>>>>>                    # (change requires restart)
>>>>>>#wal_writer_delay = 200ms        # 1-10000 milliseconds
>>>>>>#wal_writer_flush_after = 1MB        # measured in pages, 0 disables
>>>>>>
>>>>>>#commit_delay = 0            # range 0-100000, in microseconds
>>>>>>#commit_siblings = 5            # range 1-1000
>>>>>>
>>>>>># - Checkpoints -
>>>>>>
>>>>>>#checkpoint_timeout = 5min        # range 30s-1d
>>>>>>#max_wal_size = 1GB
>>>>>>#min_wal_size = 80MB
>>>>>>#checkpoint_completion_target = 0.5    # checkpoint target duration, 0.0 -
>>>>1.0
>>>>>>#checkpoint_flush_after = 256kB        # measured in pages, 0 disables
>>>>>>#checkpoint_warning = 30s        # 0 disables
>>>>>>
>>>>>># - Archiving -
>>>>>>
>>>>>>#archive_mode = off        # enables archiving; off, on, or always
>>>>>>                # (change requires restart)
>>>>>>#archive_command = ''        # command to use to archive a logfile segment
>>>>>>                # placeholders: %p = path of file to archive
>>>>>>                #               %f = file name only
>>>>>>                # e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p
>>>>>>/mnt/server/archivedir/%f'
>>>>>>#archive_timeout = 0        # force a logfile segment switch after this
>>>>>>                # number of seconds; 0 disables
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># REPLICATION
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># - Sending Server(s) -
>>>>>>
>>>>>># Set these on the master and on any standby that will send replication
>>data.
>>>>>>
>>>>>>#max_wal_senders = 10        # max number of walsender processes
>>>>>>                # (change requires restart)
>>>>>>#wal_keep_segments = 0        # in logfile segments, 16MB each; 0 disables
>>>>>>#wal_sender_timeout = 60s    # in milliseconds; 0 disables
>>>>>>
>>>>>>#max_replication_slots = 10    # max number of replication slots
>>>>>>                # (change requires restart)
>>>>>>#track_commit_timestamp = off    # collect timestamp of transaction commit
>>>>>>                # (change requires restart)
>>>>>>
>>>>>># - Master Server -
>>>>>>
>>>>>># These settings are ignored on a standby server.
>>>>>>
>>>>>>#synchronous_standby_names = ''    # standby servers that provide sync rep
>>>>>>                # method to choose sync standbys, number of sync standbys,
>>>>>>                # and comma-separated list of application_name
>>>>>>                # from standby(s); '*' = all
>>>>>>#vacuum_defer_cleanup_age = 0    # number of xacts by which cleanup is delayed
>>>>>>
>>>>>># - Standby Servers -
>>>>>>
>>>>>># These settings are ignored on a master server.
>>>>>>
>>>>>>#hot_standby = on            # "off" disallows queries during recovery
>>>>>>                    # (change requires restart)
>>>>>>#max_standby_archive_delay = 30s    # max delay before canceling queries
>>>>>>                    # when reading WAL from archive;
>>>>>>                    # -1 allows indefinite delay
>>>>>>#max_standby_streaming_delay = 30s    # max delay before canceling queries
>>>>>>                    # when reading streaming WAL;
>>>>>>                    # -1 allows indefinite delay
>>>>>>#wal_receiver_status_interval = 10s    # send replies at least this often
>>>>>>                    # 0 disables
>>>>>>#hot_standby_feedback = off        # send info from standby to prevent
>>>>>>                    # query conflicts
>>>>>>#wal_receiver_timeout = 60s        # time that receiver waits for
>>>>>>                    # communication from master
>>>>>>                    # in milliseconds; 0 disables
>>>>>>#wal_retrieve_retry_interval = 5s    # time to wait before retrying to
>>>>>>                    # retrieve WAL after a failed attempt
>>>>>>
>>>>>># - Subscribers -
>>>>>>
>>>>>># These settings are ignored on a publisher.
>>>>>>
>>>>>>#max_logical_replication_workers = 4    # taken from max_worker_processes
>>>>>>                    # (change requires restart)
>>>>>>#max_sync_workers_per_subscription = 2    # taken from
>>>>>>max_logical_replication_workers
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># QUERY TUNING
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># - Planner Method Configuration -
>>>>>>
>>>>>>#enable_bitmapscan = on
>>>>>>#enable_hashagg = on
>>>>>>#enable_hashjoin = on
>>>>>>#enable_indexscan = on
>>>>>>#enable_indexonlyscan = on
>>>>>>#enable_material = on
>>>>>>#enable_mergejoin = on
>>>>>>#enable_nestloop = on
>>>>>>#enable_seqscan = on
>>>>>>#enable_sort = on
>>>>>>#enable_tidscan = on
>>>>>>
>>>>>># - Planner Cost Constants -
>>>>>>
>>>>>>#seq_page_cost = 1.0            # measured on an arbitrary scale
>>>>>>#random_page_cost = 4.0            # same scale as above
>>>>>>#cpu_tuple_cost = 0.01            # same scale as above
>>>>>>#cpu_index_tuple_cost = 0.005        # same scale as above
>>>>>>#cpu_operator_cost = 0.0025        # same scale as above
>>>>>>#parallel_tuple_cost = 0.1        # same scale as above
>>>>>>#parallel_setup_cost = 1000.0    # same scale as above
>>>>>>#min_parallel_table_scan_size = 8MB
>>>>>>#min_parallel_index_scan_size = 512kB #effective_cache_size = 4GB
>>>>>>
>>>>>># - Genetic Query Optimizer -
>>>>>>
>>>>>>#geqo = on
>>>>>>#geqo_threshold = 12
>>>>>>#geqo_effort = 5            # range 1-10
>>>>>>#geqo_pool_size = 0            # selects default based on effort
>>>>>>#geqo_generations = 0            # selects default based on effort
>>>>>>#geqo_selection_bias = 2.0        # range 1.5-2.0
>>>>>>#geqo_seed = 0.0            # range 0.0-1.0
>>>>>>
>>>>>># - Other Planner Options -
>>>>>>
>>>>>>#default_statistics_target = 100    # range 1-10000
>>>>>>#constraint_exclusion = partition    # on, off, or partition
>>>>>>#cursor_tuple_fraction = 0.1        # range 0.0-1.0
>>>>>>#from_collapse_limit = 8
>>>>>>#join_collapse_limit = 8        # 1 disables collapsing of explicit
>>>>>>                    # JOIN clauses
>>>>>>#force_parallel_mode = off
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># ERROR REPORTING AND LOGGING
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># - Where to Log -
>>>>>>
>>>>>>log_destination = 'stderr'        # Valid values are combinations of
>>>>>>                    # stderr, csvlog, syslog, and eventlog,
>>>>>>                    # depending on platform.  csvlog
>>>>>>                    # requires logging_collector to be on.
>>>>>>
>>>>>># This is used when logging to stderr:
>>>>>>logging_collector = on            # Enable capturing of stderr and csvlog
>>>>>>                    # into log files. Required to be on for
>>>>>>                    # csvlogs.
>>>>>>                    # (change requires restart)
>>>>>>
>>>>>># These are only used if logging_collector is on:
>>>>>>#log_directory = 'log'            # directory where log files are written,
>>>>>>                    # can be absolute or relative to PGDATA
>>>>>>#log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'    # log file name
>>pattern,
>>>>>>                    # can include strftime() escapes
>>>>>>#log_file_mode = 0600            # creation mode for log files,
>>>>>>                    # begin with 0 to use octal notation
>>>>>>#log_truncate_on_rotation = off        # If on, an existing log file with the
>>>>>>                    # same name as the new log file will be
>>>>>>                    # truncated rather than appended to.
>>>>>>                    # But such truncation only occurs on
>>>>>>                    # time-driven rotation, not on restarts
>>>>>>                    # or size-driven rotation.  Default is
>>>>>>                    # off, meaning append to existing files
>>>>>>                    # in all cases.
>>>>>>#log_rotation_age = 1d            # Automatic rotation of logfiles will
>>>>>>                    # happen after that time.  0 disables.
>>>>>>#log_rotation_size = 10MB        # Automatic rotation of logfiles will
>>>>>>                    # happen after that much log output.
>>>>>>                    # 0 disables.
>>>>>>
>>>>>># These are relevant when logging to syslog:
>>>>>>#syslog_facility = 'LOCAL0'
>>>>>>#syslog_ident = 'postgres'
>>>>>>#syslog_sequence_numbers = on
>>>>>>#syslog_split_messages = on
>>>>>>
>>>>>># This is only relevant when logging to eventlog (win32):
>>>>>># (change requires restart)
>>>>>>#event_source = 'PostgreSQL'
>>>>>>
>>>>>># - When to Log -
>>>>>>
>>>>>>#log_min_messages = warning        # values in order of decreasing detail:
>>>>>>                    #   debug5
>>>>>>                    #   debug4
>>>>>>                    #   debug3
>>>>>>                    #   debug2
>>>>>>                    #   debug1
>>>>>>                    #   info
>>>>>>                    #   notice
>>>>>>                    #   warning
>>>>>>                    #   error
>>>>>>                    #   log
>>>>>>                    #   fatal
>>>>>>                    #   panic
>>>>>>
>>>>>>#log_min_error_statement = error    # values in order of decreasing detail:
>>>>>>                    #   debug5
>>>>>>                    #   debug4
>>>>>>                    #   debug3
>>>>>>                    #   debug2
>>>>>>                    #   debug1
>>>>>>                    #   info
>>>>>>                    #   notice
>>>>>>                    #   warning
>>>>>>                    #   error
>>>>>>                    #   log
>>>>>>                    #   fatal
>>>>>>                    #   panic (effectively off)
>>>>>>
>>>>>>#log_min_duration_statement = -1    # -1 is disabled, 0 logs all statements
>>>>>>                    # and their durations, > 0 logs only
>>>>>>                    # statements running at least this number
>>>>>>                    # of milliseconds
>>>>>>
>>>>>>
>>>>>># - What to Log -
>>>>>>
>>>>>>#debug_print_parse = off
>>>>>>#debug_print_rewritten = off
>>>>>>#debug_print_plan = off
>>>>>>#debug_pretty_print = on
>>>>>>#log_checkpoints = off
>>>>>>#log_connections = off
>>>>>>#log_disconnections = off
>>>>>>#log_duration = off
>>>>>>#log_error_verbosity = default        # terse, default, or verbose messages
>>>>>>#log_hostname = off
>>>>>>#log_line_prefix = '%m [%p] '        # special values:
>>>>>>log_line_prefix = '%m %d %u [%p]'
>>>>>>                    #   %a = application name
>>>>>>                    #   %u = user name
>>>>>>                    #   %d = database name
>>>>>>                    #   %r = remote host and port
>>>>>>                    #   %h = remote host
>>>>>>                    #   %p = process ID
>>>>>>                    #   %t = timestamp without milliseconds
>>>>>>                    #   %m = timestamp with milliseconds
>>>>>>                    #   %n = timestamp with milliseconds (as a Unix epoch)
>>>>>>                    #   %i = command tag
>>>>>>                    #   %e = SQL state
>>>>>>                    #   %c = session ID
>>>>>>                    #   %l = session line number
>>>>>>                    #   %s = session start timestamp
>>>>>>                    #   %v = virtual transaction ID
>>>>>>                    #   %x = transaction ID (0 if none)
>>>>>>                    #   %q = stop here in non-session
>>>>>>                    #        processes
>>>>>>                    #   %% = '%'
>>>>>>                    # e.g. '<%u%%%d> '
>>>>>>#log_lock_waits = off            # log lock waits >= deadlock_timeout
>>>>>>#log_statement = 'none'            # none, ddl, mod, all
>>>>>>#log_replication_commands = off
>>>>>>#log_temp_files = -1            # log temporary files equal or larger
>>>>>>                    # than the specified size in kilobytes;
>>>>>>                    # -1 disables, 0 logs all temp files log_timezone = 'UTC'
>>>>>>
>>>>>>
>>>>>># - Process Title -
>>>>>>
>>>>>>#cluster_name = ''            # added to process titles if nonempty
>>>>>>                    # (change requires restart)
>>>>>>#update_process_title = on
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># RUNTIME STATISTICS
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># - Query/Index Statistics Collector -
>>>>>>
>>>>>>#track_activities = on
>>>>>>#track_counts = on
>>>>>>#track_io_timing = off
>>>>>>#track_functions = none            # none, pl, all
>>>>>>#track_activity_query_size = 1024    # (change requires restart)
>>>>>>#stats_temp_directory = 'pg_stat_tmp'
>>>>>>
>>>>>>
>>>>>># - Statistics Monitoring -
>>>>>>
>>>>>>#log_parser_stats = off
>>>>>>#log_planner_stats = off
>>>>>>#log_executor_stats = off
>>>>>>#log_statement_stats = off
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># AUTOVACUUM PARAMETERS
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>>#autovacuum = on            # Enable autovacuum subprocess?  'on'
>>>>>>                    # requires track_counts to also be on.
>>>>>>#log_autovacuum_min_duration = -1    # -1 disables, 0 logs all actions and
>>>>>>                    # their durations, > 0 logs only
>>>>>>                    # actions running at least this number
>>>>>>                    # of milliseconds.
>>>>>>#autovacuum_max_workers = 3        # max number of autovacuum subprocesses
>>>>>>                    # (change requires restart)
>>>>>>#autovacuum_naptime = 1min        # time between autovacuum runs
>>>>>>#autovacuum_vacuum_threshold = 50    # min number of row updates before
>>>>>>                    # vacuum
>>>>>>#autovacuum_analyze_threshold = 50    # min number of row updates before
>>>>>>                    # analyze
>>>>>>#autovacuum_vacuum_scale_factor = 0.2    # fraction of table size before
>>>>>>vacuum
>>>>>>#autovacuum_analyze_scale_factor = 0.1    # fraction of table size before
>>>>>>analyze
>>>>>>#autovacuum_freeze_max_age = 200000000    # maximum XID age before forced
>>>>>>vacuum
>>>>>>                    # (change requires restart)
>>>>>>#autovacuum_multixact_freeze_max_age = 400000000    # maximum multixact
>>age
>>>>>>                    # before forced vacuum
>>>>>>                    # (change requires restart)
>>>>>>#autovacuum_vacuum_cost_delay = 20ms    # default vacuum cost delay for
>>>>>>                    # autovacuum, in milliseconds;
>>>>>>                    # -1 means use vacuum_cost_delay
>>>>>>#autovacuum_vacuum_cost_limit = -1    # default vacuum cost limit for
>>>>>>                    # autovacuum, -1 means use
>>>>>>                    # vacuum_cost_limit
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># CLIENT CONNECTION DEFAULTS
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># - Statement Behavior -
>>>>>>
>>>>>>#client_min_messages = notice        # values in order of decreasing detail:
>>>>>>                    #   debug5
>>>>>>                    #   debug4
>>>>>>                    #   debug3
>>>>>>                    #   debug2
>>>>>>                    #   debug1
>>>>>>                    #   log
>>>>>>                    #   notice
>>>>>>                    #   warning
>>>>>>                    #   error
>>>>>>#search_path = '"$user", public'    # schema names
>>>>>>#default_tablespace = ''        # a tablespace name, '' uses the default
>>>>>>#temp_tablespaces = ''            # a list of tablespace names, '' uses
>>>>>>                    # only default tablespace
>>>>>>#check_function_bodies = on
>>>>>>#default_transaction_isolation = 'read committed'
>>>>>>#default_transaction_read_only = off #default_transaction_deferrable
>>>>>>= off #session_replication_role = 'origin'
>>>>>>#statement_timeout = 0            # in milliseconds, 0 is disabled
>>>>>>#lock_timeout = 0            # in milliseconds, 0 is disabled
>>>>>>#idle_in_transaction_session_timeout = 0    # in milliseconds, 0 is disabled
>>>>>>#vacuum_freeze_min_age = 50000000
>>>>>>#vacuum_freeze_table_age = 150000000
>>>>>>#vacuum_multixact_freeze_min_age = 5000000
>>>>>>#vacuum_multixact_freeze_table_age = 150000000
>>>>>>#bytea_output = 'hex'            # hex, escape
>>>>>>#xmlbinary = 'base64'
>>>>>>#xmloption = 'content'
>>>>>>#gin_fuzzy_search_limit = 0
>>>>>>#gin_pending_list_limit = 4MB
>>>>>>
>>>>>># - Locale and Formatting -
>>>>>>
>>>>>>datestyle = 'iso, mdy'
>>>>>>#intervalstyle = 'postgres'
>>>>>>timezone = 'UTC'
>>>>>>#timezone_abbreviations = 'Default'     # Select the set of available time
>>>>zone
>>>>>>                    # abbreviations.  Currently, there are
>>>>>>                    #   Default
>>>>>>                    #   Australia (historical usage)
>>>>>>                    #   India
>>>>>>                    # You can create your own file in
>>>>>>                    # share/timezonesets/.
>>>>>>#extra_float_digits = 0            # min -15, max 3
>>>>>>#client_encoding = sql_ascii        # actually, defaults to database
>>>>>>                    # encoding
>>>>>>
>>>>>># These settings are initialized by initdb, but they can be changed.
>>>>>>lc_messages = 'en_US.UTF-8'            # locale for system error message
>>>>>>                    # strings
>>>>>>lc_monetary = 'en_US.UTF-8'            # locale for monetary formatting
>>>>>>lc_numeric = 'en_US.UTF-8'            # locale for number formatting
>>>>>>lc_time = 'en_US.UTF-8'                # locale for time formatting
>>>>>>
>>>>>># default configuration for text search default_text_search_config =
>>>>>>'pg_catalog.english'
>>>>>>
>>>>>># - Other Defaults -
>>>>>>
>>>>>>#dynamic_library_path = '$libdir'
>>>>>>#local_preload_libraries = ''
>>>>>>#session_preload_libraries = ''
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># LOCK MANAGEMENT
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>>#deadlock_timeout = 1s
>>>>>>#max_locks_per_transaction = 64        # min 10
>>>>>>                    # (change requires restart)
>>>>>>#max_pred_locks_per_transaction = 64    # min 10
>>>>>>                    # (change requires restart)
>>>>>>#max_pred_locks_per_relation = -2    # negative values mean
>>>>>>                    # (max_pred_locks_per_transaction
>>>>>>                    #  / -max_pred_locks_per_relation) - 1
>>>>>>#max_pred_locks_per_page = 2            # min 0
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># VERSION/PLATFORM COMPATIBILITY
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># - Previous PostgreSQL Versions -
>>>>>>
>>>>>>#array_nulls = on
>>>>>>#backslash_quote = safe_encoding    # on, off, or safe_encoding
>>>>>>#default_with_oids = off
>>>>>>#escape_string_warning = on
>>>>>>#lo_compat_privileges = off
>>>>>>#operator_precedence_warning = off
>>>>>>#quote_all_identifiers = off
>>>>>>#standard_conforming_strings = on
>>>>>>#synchronize_seqscans = on
>>>>>>
>>>>>># - Other Platforms and Clients -
>>>>>>
>>>>>>#transform_null_equals = off
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># ERROR HANDLING
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>>#exit_on_error = off            # terminate session on any error?
>>>>>>#restart_after_crash = on        # reinitialize after backend crash?
>>>>>>#data_sync_retry = off            # retry or panic on failure to fsync
>>>>>>                    # data?
>>>>>>                    # (change requires restart)
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># CONFIG FILE INCLUDES
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># These options allow settings to be loaded from files other than
>>>>>>the # default postgresql.conf.
>>>>>>
>>>>>>#include_dir = ''            # include files ending in '.conf' from
>>>>>>                    # a directory, e.g., 'conf.d'
>>>>>>#include_if_exists = ''            # include file only if it exists
>>>>>>#include = ''                # include file
>>>>>>
>>>>>>
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>># CUSTOMIZED OPTIONS
>>>>>>#-------------------------------------------------------------------
>>>>>>--
>>>>>>----
>>>>>>-----
>>>>>>
>>>>>># Add settings for extensions here
>>>>>>
>>>>>>
>>>>>>BRs,
>>>>>>Fan Liu
>>>>>>ADP Document Database PG
>>>>>>
>>>>>>>>-----Original Message-----
>>>>>>>>From: Jaime Casanova <jaime.casanova@2ndquadrant.com>
>>>>>>>>Sent: 2020年3月27日 14:36
>>>>>>>>To: Fan Liu <fan.liu@ericsson.com>
>>>>>>>>Cc: Sergei Kornilov <sk@zsrv.org>; PostgreSQL mailing lists
>>>>>>>><pgsql-bugs@lists.postgresql.org>
>>>>>>>>Subject: Re: why wal_max_size does not work?
>>>>>>>>
>>>>>>>>On Fri, 27 Mar 2020 at 01:10, Fan Liu <fan.liu@ericsson.com> wrote:
>>>>>>>>>
>>>>>>>>> So, I wan to know under what kind of scenario that there will
>>>>>>>>> not be recycling
>>>>>>>>old WAL files.
>>>>>>>>> Is there any way I can check the recycling? For example, logs?
>>>>>>>>>
>>>>>>>>
>>>>>>>>please, i would like to see the contents of postgresql.base.conf',
>>>>>>>>maybe is changing a parameter that is not touched in
>>>>>>>>postgresql.conf, and postgresql.auto.conf for the same reason
>>>>>>>>
>>>>>>>>also, show us the output of: select * from pg_replication_slots if
>>>>>>>>there's any replication slot not connected to the server is
>>>>>>>>protecting, primary will keep the wals until the server comes back
>>>>>>>>
>>>>>>>>finally, while this seems not to be your case, a high
>>>>>>>>wal_keep_segments can cause this problem too
>>>>>>>>
>>>>>>>>--
>>>>>>>>Jaime Casanova                      www.2ndQuadrant.com
>>>>>>>>PostgreSQL Development, 24x7 Support, Remote DBA, Training &
>>>>>>>>Services