F.32. online_analyze
The online_analyze module provides a set of features that immediately update statistics after INSERT, UPDATE, DELETE, or SELECT INTO operations for the affected tables.
Note
This extension cannot be used together with autonomous transactions.
F.32.1. Module Loading
To use online_analyze module, load the shared library:
LOAD 'online_analyze';
F.32.2. Module Configuration
You can configure online_analyze using the following custom variables (default values are shown):
online_analyze.enable = on
Enables
online_analyze.online_analyze.verbose = on
Executes
ANALYZE VERBOSE.Note
Since
verboseis a reserved SQL key word, this parameter has to be double-quoted when used in SQL queries. For example:ALTER SYSTEM SET "online_analyze.verbose" = 'off';
online_analyze.scale_factor = 0.1
Fraction of table size to start online analysis (similar to autovacuum_analyze_scale_factor).
online_analyze.threshold = 50
Minimum number of row updates before starting online analysis (similar to autovacuum_analyze_threshold).
online_analyze.min_interval = 10000
Minimum time interval between
ANALYZEcalls per table, in milliseconds.online_analyze.table_type = "all"
Type(s) of tables for online analysis. Possible values are:
all,persistent,temporary,none.online_analyze.exclude_tables = ""
List of tables to exclude from online analysis.
online_analyze.include_tables = ""
List of tables to include in online analysis (
online_analyze.include_tablesoverridesonline_analyze.exclude_tables).online_analyze.local_tracking = off
Enables per-backend tracking for temporary tables by
online_analyze. When this variable is set tooff,online_analyzeuses the default system statistics for temporary tables.online_analyze.lower_limit = 0
Minimum number of rows in a table required to trigger
online_analyze.online_analyze.capacity_threshold = 100000
Maximum number of temporary tables to store in local cache.
F.32.3. Authors
Teodor Sigaev <teodor@sigaev.ru>