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Have TRUNCATE advance the affected table's relfrozenxid to RecentXmin, to

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avoid a later needless VACUUM for Xid-wraparound purposes.  We can do this
since the table is known to be left empty, so no Xid remains on it.

Per discussion.
This commit is contained in:
Alvaro Herrera
2007-05-16 17:28:20 +00:00
parent dfed0012bc
commit 90cbc63fd1
3 changed files with 16 additions and 8 deletions
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6
src/backend/commands/tablecmds.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.223 2007/05/14 20:24:41 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.224 2007/05/16 17:28:20 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@ -616,7 +616,7 @@ ExecuteTruncate(TruncateStmt *stmt)
* the relfilenode value. The old storage file is scheduled for
* deletion at commit.
*/
setNewRelfilenode(rel);
setNewRelfilenode(rel, RecentXmin);
heap_relid = RelationGetRelid(rel);
toast_relid = rel->rd_rel->reltoastrelid;
@ -629,7 +629,7 @@ ExecuteTruncate(TruncateStmt *stmt)
if (OidIsValid(toast_relid))
{
rel = relation_open(toast_relid, AccessExclusiveLock);
setNewRelfilenode(rel);
setNewRelfilenode(rel, RecentXmin);
heap_close(rel, NoLock);
}