diff options
| author | Melanie Plageman | 2025-03-03 16:18:05 +0000 |
|---|---|---|
| committer | Melanie Plageman | 2025-03-03 16:18:05 +0000 |
| commit | 99f8f3fbbc8f743290844e8c676d39dad11c5d5d (patch) | |
| tree | bfa0507e88c83d28053a7e8beb36d8d61b43b871 /src/backend/catalog/index.c | |
| parent | 8492feb98f6df3f0f03e84ed56f0d1cbb2ac514c (diff) | |
Add relallfrozen to pg_class
Add relallfrozen, an estimate of the number of pages marked all-frozen
in the visibility map.
pg_class already has relallvisible, an estimate of the number of pages
in the relation marked all-visible in the visibility map. This is used
primarily for planning.
relallfrozen, together with relallvisible, is useful for estimating the
outstanding number of all-visible but not all-frozen pages in the
relation for the purposes of scheduling manual VACUUMs and tuning vacuum
freeze parameters.
A future commit will use relallfrozen to trigger more frequent vacuums
on insert-focused workloads with significant volume of frozen data.
Bump catalog version
Author: Melanie Plageman <[email protected]>
Reviewed-by: Nathan Bossart <[email protected]>
Reviewed-by: Robert Treat <[email protected]>
Reviewed-by: Corey Huinker <[email protected]>
Reviewed-by: Greg Sabino Mullane <[email protected]>
Discussion: https://postgr.es/m/flat/CAAKRu_aj-P7YyBz_cPNwztz6ohP%2BvWis%3Diz3YcomkB3NpYA--w%40mail.gmail.com
Diffstat (limited to 'src/backend/catalog/index.c')
| -rw-r--r-- | src/backend/catalog/index.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c index f37b990c81d..8e1741c81f5 100644 --- a/src/backend/catalog/index.c +++ b/src/backend/catalog/index.c @@ -2793,8 +2793,8 @@ FormIndexDatum(IndexInfo *indexInfo, * hasindex: set relhasindex to this value * reltuples: if >= 0, set reltuples to this value; else no change * - * If reltuples >= 0, relpages and relallvisible are also updated (using - * RelationGetNumberOfBlocks() and visibilitymap_count()). + * If reltuples >= 0, relpages, relallvisible, and relallfrozen are also + * updated (using RelationGetNumberOfBlocks() and visibilitymap_count()). * * NOTE: an important side-effect of this operation is that an SI invalidation * message is sent out to all backends --- including me --- causing relcache @@ -2812,6 +2812,7 @@ index_update_stats(Relation rel, bool update_stats; BlockNumber relpages = 0; /* keep compiler quiet */ BlockNumber relallvisible = 0; + BlockNumber relallfrozen = 0; Oid relid = RelationGetRelid(rel); Relation pg_class; ScanKeyData key[1]; @@ -2851,7 +2852,7 @@ index_update_stats(Relation rel, relpages = RelationGetNumberOfBlocks(rel); if (rel->rd_rel->relkind != RELKIND_INDEX) - visibilitymap_count(rel, &relallvisible, NULL); + visibilitymap_count(rel, &relallvisible, &relallfrozen); } /* @@ -2924,6 +2925,11 @@ index_update_stats(Relation rel, rd_rel->relallvisible = (int32) relallvisible; dirty = true; } + if (rd_rel->relallfrozen != (int32) relallfrozen) + { + rd_rel->relallfrozen = (int32) relallfrozen; + dirty = true; + } } /* |