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Add PROCESS_MAIN to VACUUM

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Disabling this option is useful to run VACUUM (with or without FULL) on
only the toast table of a relation, bypassing the main relation.  This
option is enabled by default.

Running directly VACUUM on a toast table was already possible without
this feature, by using the non-deterministic name of a toast relation
(as of pg_toast.pg_toast_N, where N would be the OID of the parent
relation) in the VACUUM command, and it required a scan of pg_class to
know the name of the toast table.  So this feature is basically a
shortcut to be able to run VACUUM or VACUUM FULL on a toast relation,
using only the name of the parent relation.

A new switch called --no-process-main is added to vacuumdb, to work as
an equivalent of PROCESS_MAIN.

Regression tests are added to cover VACUUM and VACUUM FULL, looking at
pg_stat_all_tables.vacuum_count to see how many vacuums have run on
each table, main or toast.

Author: Nathan Bossart
Reviewed-by: Masahiko Sawada
Discussion: https://postgr.es/m/20221230000028.GA435655@nathanxps13
This commit is contained in:
Michael Paquier
2023-03-06 16:41:05 +09:00
parent 46d490ac19
commit 4211fbd841
10 changed files with 156 additions and 15 deletions
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9
src/include/commands/vacuum.h
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@@ -186,10 +186,11 @@ typedef struct VacAttrStats
#define VACOPT_FREEZE 0x08 /* FREEZE option */
#define VACOPT_FULL 0x10 /* FULL (non-concurrent) vacuum */
#define VACOPT_SKIP_LOCKED 0x20 /* skip if cannot get lock */
#define VACOPT_PROCESS_TOAST 0x40 /* process the TOAST table, if any */
#define VACOPT_DISABLE_PAGE_SKIPPING 0x80 /* don't skip any pages */
#define VACOPT_SKIP_DATABASE_STATS 0x100 /* skip vac_update_datfrozenxid() */
#define VACOPT_ONLY_DATABASE_STATS 0x200 /* only vac_update_datfrozenxid() */
#define VACOPT_PROCESS_MAIN 0x40 /* process main relation */
#define VACOPT_PROCESS_TOAST 0x80 /* process the TOAST table, if any */
#define VACOPT_DISABLE_PAGE_SKIPPING 0x100 /* don't skip any pages */
#define VACOPT_SKIP_DATABASE_STATS 0x200 /* skip vac_update_datfrozenxid() */
#define VACOPT_ONLY_DATABASE_STATS 0x400 /* only vac_update_datfrozenxid() */
/*
* Values used by index_cleanup and truncate params.