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| author | Melanie Plageman | 2025-03-03 19:42:00 +0000 |
|---|---|---|
| committer | Melanie Plageman | 2025-03-03 19:42:00 +0000 |
| commit | 06eae9e6218ab2acf64ea497bad0360e4c90e32d (patch) | |
| tree | c9346e7a784ad9dcd4947c65bf6abadc24ada853 /src/backend/utils | |
| parent | 35c8dd9e1176ae0c3cb060b0da9cb2bba925363c (diff) | |
Trigger more frequent autovacuums with relallfrozen
Calculate the insert threshold for triggering an autovacuum of a
relation based on the number of unfrozen pages.
By only considering the unfrozen portion of the table when calculating
how many tuples to add to the insert threshold, we can trigger more
frequent vacuums of insert-heavy tables. This increases the chances of
vacuuming those pages when they still reside in shared buffers
This also increases the number of autovacuums triggered by tuples
inserted and not by wraparound risk. We prefer to freeze these pages
during insert-triggered autovacuums, as anti-wraparound vacuums are not
automatically canceled by conflicting lock requests.
We calculate the unfrozen percentage of the table using the recently
added (99f8f3fbbc8f) relallfrozen column of pg_class.
Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Reviewed-by: Greg Sabino Mullane <htamfids@gmail.com>
Reviewed-by: Robert Treat <rob@xzilla.net>
Reviewed-by: wenhui qiu <qiuwenhuifx@gmail.com>
Discussion: https://postgr.es/m/flat/CAAKRu_aj-P7YyBz_cPNwztz6ohP%2BvWis%3Diz3YcomkB3NpYA--w%40mail.gmail.com
Diffstat (limited to 'src/backend/utils')
| -rw-r--r-- | src/backend/utils/misc/postgresql.conf.sample | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample index 5362ff80519..2d1de9c37bd 100644 --- a/src/backend/utils/misc/postgresql.conf.sample +++ b/src/backend/utils/misc/postgresql.conf.sample @@ -675,8 +675,8 @@ autovacuum_worker_slots = 16 # autovacuum worker slots to allocate #autovacuum_analyze_threshold = 50 # min number of row updates before # analyze #autovacuum_vacuum_scale_factor = 0.2 # fraction of table size before vacuum -#autovacuum_vacuum_insert_scale_factor = 0.2 # fraction of inserts over table - # size before insert vacuum +#autovacuum_vacuum_insert_scale_factor = 0.2 # fraction of unfrozen pages + # before insert vacuum #autovacuum_analyze_scale_factor = 0.1 # fraction of table size before analyze #autovacuum_vacuum_max_threshold = 100000000 # max number of row updates # before vacuum; -1 disables max |