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/commands/vacuum.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/commands/vacuum.c')
| -rw-r--r-- | src/backend/commands/vacuum.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/backend/commands/vacuum.c b/src/backend/commands/vacuum.c index 0239d9bae65..e81c9a8aba3 100644 --- a/src/backend/commands/vacuum.c +++ b/src/backend/commands/vacuum.c @@ -1427,6 +1427,7 @@ void vac_update_relstats(Relation relation, BlockNumber num_pages, double num_tuples, BlockNumber num_all_visible_pages, + BlockNumber num_all_frozen_pages, bool hasindex, TransactionId frozenxid, MultiXactId minmulti, bool *frozenxid_updated, bool *minmulti_updated, @@ -1476,6 +1477,11 @@ vac_update_relstats(Relation relation, pgcform->relallvisible = (int32) num_all_visible_pages; dirty = true; } + if (pgcform->relallfrozen != (int32) num_all_frozen_pages) + { + pgcform->relallfrozen = (int32) num_all_frozen_pages; + dirty = true; + } /* Apply DDL updates, but not inside an outer transaction (see above) */ |