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Add vacuum_truncate configuration parameter.

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This new parameter works just like the storage parameter of the
same name: if set to true (which is the default), autovacuum and
VACUUM attempt to truncate any empty pages at the end of the table.
It is primarily intended to help users avoid locking issues on hot
standbys.  The setting can be overridden with the storage parameter
or VACUUM's TRUNCATE option.

Since there's presently no way to determine whether a Boolean
storage parameter is explicitly set or has just picked up the
default value, this commit also introduces an isset_offset member
to relopt_parse_elt.

Suggested-by: Will Storey <will@summercat.com>
Author: Nathan Bossart <nathandbossart@gmail.com>
Co-authored-by: Gurjeet Singh <gurjeet@singh.im>
Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at>
Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Robert Treat <rob@xzilla.net>
Discussion: https://postgr.es/m/Z2DE4lDX4tHqNGZt%40dev.null
This commit is contained in:
Nathan Bossart
2025-03-20 10:16:50 -05:00
parent 618c64ffd3
commit 0164a0f9ee
13 changed files with 116 additions and 15 deletions
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17
src/backend/commands/vacuum.c
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@@ -78,6 +78,7 @@ int vacuum_failsafe_age;
int vacuum_multixact_failsafe_age;
double vacuum_max_eager_freeze_failure_rate;
bool track_cost_delay_timing;
bool vacuum_truncate;
/*
* Variables for cost-based vacuum delay. The defaults differ between
@@ -2198,13 +2199,21 @@ vacuum_rel(Oid relid, RangeVar *relation, VacuumParams *params,
((StdRdOptions *) rel->rd_options)->vacuum_max_eager_freeze_failure_rate;
/*
* Set truncate option based on truncate reloption if it wasn't specified
* in VACUUM command, or when running in an autovacuum worker
* Set truncate option based on truncate reloption or GUC if it wasn't
* specified in VACUUM command, or when running in an autovacuum worker
*/
if (params->truncate == VACOPTVALUE_UNSPECIFIED)
{
if (rel->rd_options == NULL ||
((StdRdOptions *) rel->rd_options)->vacuum_truncate)
StdRdOptions *opts = (StdRdOptions *) rel->rd_options;
if (opts && opts->vacuum_truncate_set)
{
if (opts->vacuum_truncate)
params->truncate = VACOPTVALUE_ENABLED;
else
params->truncate = VACOPTVALUE_DISABLED;
}
else if (vacuum_truncate)
params->truncate = VACOPTVALUE_ENABLED;
else
params->truncate = VACOPTVALUE_DISABLED;