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Blog >> PostgreSQL
Monitoring Wait Events in PostgreSQL 9.6
profile WHERE event IS NOT NULL GROUP BY event_type, event; GET DIAGNOSTICS result = ROW_COUNT; PERFORM pg_wait_sampling_reset
Blog >> PostgreSQL
Queries in PostgreSQL: 2. Statistics
filed width in a column. Field width for data types such as integer or char(3) is obviously fixed, but when it comes to data types with no set width
Blog >> PostgreSQL
Queries in PostgreSQL: 1. Query execution stages
set by LIMIT, for example), the operation will not be executed fully. The two SEQSCAN leafs are table scans. Upon request from the parent node, a leaf node reads the next row from the table
Blog >> PostgreSQL
Queries in PostgreSQL: 4. Index scan
SET enable_bitmapscan = off; EXPLAIN SELECT * FROM bookings WHERE book_date < '2016-08-23 12:00:00+03'; QUERY PLAN
Blog >> PostgreSQL
Queries in PostgreSQL: 3. Sequential scan
file. Sequential scan is the most cost-effective way of scanning a whole table or a significant portion of it. In other words, sequential scan is efficient when selectivity is low. At higher selectivity, when
Blog >> PostgreSQL
PostgreSQL 18: part 4 or CommitFest 2025-01
set the new number in autovacuum_max_workers and reload the configuration files, as long
Blog >> PostgreSQL
PostgreSQL 18: part 3 or CommitFest 2024-11
reset(); Using pgbench , start 10 processes, each running queries in parallel mode: $ pgbench --client=10 --time=5 --file
Blog >> Postgres Pro Enterprise
What's New in Postgres Pro Enterprise 17: From Proxima to Intelligent Data Management
set of hints formed based on the frozen execution plan, including optimizer environment variables, join types, join order, and data access methods, similar to those supported by the pg_hint_plan extension. Unlike previous plan
Blog >> PostgreSQL
PostgreSQL 18: part 2 or CommitFest 2024-09
SET commands postgres_fdw_get_connections and remote connection status file_fdw: ignore format conversion
Blog >> PostgreSQL
PostgreSQL 18: part 1 or CommitFest 2024-07
set of functions. The new function pg_get_acl returns the object access rights without the need to query a specific system catalog. This query shows what privileges the role alice has: SELECT *, pg_identify
Blog >> PostgreSQL
PostgreSQL 17: part 5 or CommitFest 2024-03
sets the jsonlog server log format instead of the expected csvlog , the log analysis tools will stop working. To avoid the temptation to edit postgresql.conf, access to the server file
Blog >> PostgreSQL
PostgreSQL 17: part 4 or CommitFest 2024-01
SET summarize_wal = on; SELECT pg_reload_conf(); The new process appears in pg_stat_activity and starts recording page changes in pg_wal/summaries in a compact form. First, create a full backup
Blog >> PostgreSQL
PostgreSQL 17: part 3 or CommitFest 2023-11
set custom parameters in the main configuration file postgresql.conf . Building the server from source
Blog >> PostgreSQL
PostgreSQL 17: part 2 or CommitFest 2023-09
SET jit_tuple_deforming = off; The JIT section of the plan: JIT: Functions: 5 Options: Inlining true, Optimization true, Expressions true, Deforming false Timing: Generation 0.665 ms (Deform 0.000 ms), Inlining 15.209 ms, Optimization
Blog >> PostgreSQL
PostgreSQL 17: part 1 or CommitFest 2023-07
SET ROLE: better role change management Roles with the CREATEROLE attribute The parameter io_direct is renamed to debug_io_direct commit: 319bae9a PostgreSQL 16 introduced a new debugging parameter io_direct . To avoid