From 6a10f0f74957190b093f1b1147b1f2767548db90 Mon Sep 17 00:00:00 2001
From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Mon, 10 Sep 2007 21:40:03 +0000
Subject: [PATCH] Release the exclusive lock on the table early after
truncating it in lazy vacuum, instead of waiting till commit.
---
src/backend/commands/vacuumlazy.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
index 25e0e071a93..f9167699fa2 100644
--- a/src/backend/commands/vacuumlazy.c
+++ b/src/backend/commands/vacuumlazy.c
@@ -36,7 +36,7 @@
*
*
* 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);
+ /* Now we're OK to release the lock. */
+ UnlockRelation(onerel, AccessExclusiveLock);
+
/*
* Drop free-space info for removed blocks; these must not get entered
* into the FSM!
@@ -834,10 +837,6 @@ lazy_truncate_heap(Relation onerel, LVRelStats *vacrelstats)
vacrelstats->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,
(errmsg("\"%s\": truncated %u to %u pages",
RelationGetRelationName(onerel),
--
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