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Reduce lock level for CREATE STATISTICS

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In line with other lock reductions related to planning.

Simon Riggs
This commit is contained in:
Simon Riggs
2017-04-05 18:22:32 -04:00
parent 2686ee1b7c
commit 68ea2b7f9b
2 changed files with 9 additions and 2 deletions
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8
src/backend/commands/statscmds.c
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@ -96,7 +96,13 @@ CreateStatistics(CreateStatsStmt *stmt)
errmsg("statistics \"%s\" already exist", namestr)));
}
rel = heap_openrv(stmt->relation, AccessExclusiveLock);
/*
* CREATE STATISTICS will influence future execution plans but does
* not interfere with currently executing plans so it is safe to
* take only ShareUpdateExclusiveLock on relation, conflicting with
* ANALYZE and other DDL that sets statistical information.
*/
rel = heap_openrv(stmt->relation, ShareUpdateExclusiveLock);
relid = RelationGetRelid(rel);
if (rel->rd_rel->relkind != RELKIND_RELATION &&