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Release the exclusive lock on the table early after truncating it in lazy

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vacuum, instead of waiting till commit.
This commit is contained in:
Alvaro Herrera 2007-09-10 21:40:03 +00:00
parent f7379f5c88
commit 6a10f0f749
1 changed files with 4 additions and 5 deletions
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9
src/backend/commands/vacuumlazy.c
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@ -36,7 +36,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.92 2007/09/10 17:58:45 alvherre Exp $ * $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.93 2007/09/10 21:40:03 alvherre Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -802,6 +802,9 @@ lazy_truncate_heap(Relation onerel, LVRelStats *vacrelstats)
*/ */
RelationTruncate(onerel, new_rel_pages); RelationTruncate(onerel, new_rel_pages);
/* Now we're OK to release the lock. */
UnlockRelation(onerel, AccessExclusiveLock);
/* /*
* Drop free-space info for removed blocks; these must not get entered * Drop free-space info for removed blocks; these must not get entered
* into the FSM! * into the FSM!
@ -834,10 +837,6 @@ lazy_truncate_heap(Relation onerel, LVRelStats *vacrelstats)
vacrelstats->rel_pages = new_rel_pages; vacrelstats->rel_pages = new_rel_pages;
vacrelstats->pages_removed = old_rel_pages - new_rel_pages; vacrelstats->pages_removed = old_rel_pages - new_rel_pages;
/*
* We keep the exclusive lock until commit (perhaps not necessary)?
*/
ereport(elevel, ereport(elevel,
(errmsg("\"%s\": truncated %u to %u pages", (errmsg("\"%s\": truncated %u to %u pages",
RelationGetRelationName(onerel), RelationGetRelationName(onerel),