database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-08 11:42:09 +03:00
Code Activity

Add TRUNCATE parameter to VACUUM.

Browse Source 
This commit adds new parameter to VACUUM command, TRUNCATE,
which specifies that VACUUM should attempt to truncate off
any empty pages at the end of the table and allow the disk space
for the truncated pages to be returned to the operating system.

This parameter, if specified, overrides the vacuum_truncate
reloption. If neither the reloption nor the VACUUM option is
used, the default is true, as before.

Author: Fujii Masao
Reviewed-by: Julien Rouhaud, Masahiko Sawada
Discussion: https://postgr.es/m/CAD21AoD+qtrSDL=GSma4Wd3kLYLeRC0hPna-YAdkDeV4z156vg@mail.gmail.com
This commit is contained in:
Fujii Masao
2019-05-08 02:10:33 +09:00
parent 98719af6c2
commit b84dbc8eb8
9 changed files with 81 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
src/backend/commands/vacuum.c
View File

@ -98,6 +98,7 @@ ExecVacuum(ParseState *pstate, VacuumStmt *vacstmt, bool isTopLevel)
/* Set default value */
params.index_cleanup = VACOPT_TERNARY_DEFAULT;
params.truncate = VACOPT_TERNARY_DEFAULT;
/* Parse options list */
foreach(lc, vacstmt->options)
@ -126,6 +127,8 @@ ExecVacuum(ParseState *pstate, VacuumStmt *vacstmt, bool isTopLevel)
disable_page_skipping = defGetBoolean(opt);
else if (strcmp(opt->defname, "index_cleanup") == 0)
params.index_cleanup = get_vacopt_ternary_value(opt);
else if (strcmp(opt->defname, "truncate") == 0)
params.truncate = get_vacopt_ternary_value(opt);
else
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
@ -1760,6 +1763,16 @@ vacuum_rel(Oid relid, RangeVar *relation, VacuumParams *params)
params->index_cleanup = VACOPT_TERNARY_DISABLED;
}
/* Set truncate option based on reloptions if not yet */
if (params->truncate == VACOPT_TERNARY_DEFAULT)
{
if (onerel->rd_options == NULL ||
((StdRdOptions *) onerel->rd_options)->vacuum_truncate)
params->truncate = VACOPT_TERNARY_ENABLED;
else
params->truncate = VACOPT_TERNARY_DISABLED;
}
/*
* Remember the relation's TOAST relation for later, if the caller asked
* us to process it. In VACUUM FULL, though, the toast table is