F.28. online_analyze
Theonline_analyze module provides a set of features that immediately update statistics afterINSERT,UPDATE,DELETE, orSELECT INTO operations for the affected tables.
F.28.1. Module Loading
To useonline_analyze module, load the shared library:
LOAD 'online_analyze';
F.28.2. Module Configuration
You can configureonline_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 toautovacuum_analyze_scale_factor).
online_analyze.threshold = 50
Minimum number of row updates before starting online analysis (similar toautovacuum_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.28.3. Authors
Teodor Sigaev <teodor@sigaev.ru>