diff options
| author | Nathan Bossart | 2025-02-05 21:48:18 +0000 |
|---|---|---|
| committer | Nathan Bossart | 2025-02-05 21:48:18 +0000 |
| commit | 306dc520b9dfd6014613961962a89940a431a069 (patch) | |
| tree | f9ca35ac5ac49209a89623c0b6c554cff686752d /src/include | |
| parent | a14707da564e8c94bd123f0e3a75e194fd7ef56a (diff) | |
Introduce autovacuum_vacuum_max_threshold.
One way autovacuum chooses tables to vacuum is by comparing the
number of updated or deleted tuples with a value calculated using
autovacuum_vacuum_threshold and autovacuum_vacuum_scale_factor.
The threshold specifies the base value for comparison, and the
scale factor specifies the fraction of the table size to add to it.
This strategy ensures that smaller tables are vacuumed after fewer
updates/deletes than larger tables, which is reasonable in many
cases but can result in infrequent vacuums on very large tables.
This is undesirable for a couple of reasons, such as very large
tables incurring a huge amount of bloat between vacuums.
This new parameter provides a way to set a limit on the value
calculated with autovacuum_vacuum_threshold and
autovacuum_vacuum_scale_factor so that very large tables are
vacuumed more frequently. By default, it is set to 100,000,000
tuples, but it can be disabled by setting it to -1. It can also be
adjusted for individual tables by changing storage parameters.
Author: Nathan Bossart <nathandbossart@gmail.com>
Co-authored-by: Frédéric Yhuel <frederic.yhuel@dalibo.com>
Reviewed-by: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at>
Reviewed-by: Michael Banck <mbanck@gmx.net>
Reviewed-by: Joe Conway <mail@joeconway.com>
Reviewed-by: Sami Imseih <samimseih@gmail.com>
Reviewed-by: David Rowley <dgrowleyml@gmail.com>
Reviewed-by: wenhui qiu <qiuwenhuifx@gmail.com>
Reviewed-by: Vinícius Abrahão <vinnix.bsd@gmail.com>
Reviewed-by: Robert Treat <rob@xzilla.net>
Reviewed-by: Alena Rybakina <a.rybakina@postgrespro.ru>
Discussion: https://postgr.es/m/956435f8-3b2f-47a6-8756-8c54ded61802%40dalibo.com
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/postmaster/autovacuum.h | 1 | ||||
| -rw-r--r-- | src/include/utils/rel.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/src/include/postmaster/autovacuum.h b/src/include/postmaster/autovacuum.h index 54e01c81d68..06d4a593575 100644 --- a/src/include/postmaster/autovacuum.h +++ b/src/include/postmaster/autovacuum.h @@ -33,6 +33,7 @@ extern PGDLLIMPORT int autovacuum_max_workers; extern PGDLLIMPORT int autovacuum_work_mem; extern PGDLLIMPORT int autovacuum_naptime; extern PGDLLIMPORT int autovacuum_vac_thresh; +extern PGDLLIMPORT int autovacuum_vac_max_thresh; extern PGDLLIMPORT double autovacuum_vac_scale; extern PGDLLIMPORT int autovacuum_vac_ins_thresh; extern PGDLLIMPORT double autovacuum_vac_ins_scale; diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h index 33d1e4a4e2e..48b95f211f3 100644 --- a/src/include/utils/rel.h +++ b/src/include/utils/rel.h @@ -309,6 +309,7 @@ typedef struct AutoVacOpts { bool enabled; int vacuum_threshold; + int vacuum_max_threshold; int vacuum_ins_threshold; int analyze_threshold; int vacuum_cost_limit; |