diff options
| author | Bruce Momjian <bruce@momjian.us> | 2023-10-10 15:14:18 -0400 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2023-10-10 15:14:18 -0400 |
| commit | 17fb3673dd2157d4859136b0711b64e26afdc2b7 (patch) | |
| tree | b8918b4fd33850492931539b984859c050e6755e /doc/src | |
| parent | 469d367bee2fe26b54a7c1421fb53d3c1757fa65 (diff) | |
doc: document the need to analyze partitioned tables
Autovacuum does not do it.
Reported-by: Justin Pryzby
Discussion: https://postgr.es/m/20210913035409.GA10647@telsasoft.com
Backpatch-through: 11
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/maintenance.sgml | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml index 802fe460637..0aac6867d07 100644 --- a/doc/src/sgml/maintenance.sgml +++ b/doc/src/sgml/maintenance.sgml @@ -841,10 +841,15 @@ analyze threshold = analyze base threshold + analyze scale factor * number of tu </para> <para> - Partitioned tables are not processed by autovacuum. Statistics - should be collected by running a manual <command>ANALYZE</command> when it is - first populated, and again whenever the distribution of data in its - partitions changes significantly. + Partitioned tables do not directly store tuples and consequently + are not processed by autovacuum. (Autovacuum does process table + partitions just like other tables.) Unfortunately, this means that + autovacuum does not run <command>ANALYZE</command> on partitioned + tables, and this can cause suboptimal plans for queries that reference + partitioned table statistics. You can work around this problem by + manually running <command>ANALYZE</command> on partitioned tables + when they are first populated, and again whenever the distribution + of data in their partitions changes significantly. </para> <para> |