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Add option SKIP_LOCKED to VACUUM and ANALYZE

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When specified, this option allows VACUUM to skip the work on a relation
if there is a conflicting lock on it when trying to open it at the
beginning of its processing.

Similarly to autovacuum, this comes with a couple of limitations while
the relation is processed which can cause the process to still block:
- when opening the relation indexes.
- when acquiring row samples for table inheritance trees, partition trees
or certain types of foreign tables, and that a lock is taken on some
leaves of such trees.

Author: Nathan Bossart
Reviewed-by: Michael Paquier, Andres Freund, Masahiko Sawada
Discussion: https://postgr.es/m/9EF7EBE4-720D-4CF1-9D0E-4403D7E92990@amazon.com
Discussion: https://postgr.es/m/20171201160907.27110.74730@wrigleys.postgresql.org
This commit is contained in:
Michael Paquier
2018-10-04 09:00:33 +09:00
parent d173652797
commit 803b1301e8
10 changed files with 333 additions and 7 deletions
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12
src/backend/parser/gram.y
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@@ -10538,6 +10538,8 @@ vacuum_option_elem:
{
if (strcmp($1, "disable_page_skipping") == 0)
$$ = VACOPT_DISABLE_PAGE_SKIPPING;
else if (strcmp($1, "skip_locked") == 0)
$$ = VACOPT_SKIP_LOCKED;
else
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
@@ -10571,6 +10573,16 @@ analyze_option_list:
analyze_option_elem:
VERBOSE { $$ = VACOPT_VERBOSE; }
| IDENT
{
if (strcmp($1, "skip_locked") == 0)
$$ = VACOPT_SKIP_LOCKED;
else
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("unrecognized ANALYZE option \"%s\"", $1),
parser_errposition(@1)));
}
;
analyze_keyword: