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Prevent CLUSTER from decreasing a relation's relfrozenxid. Bug 

introduced in rewrite to make CLUSTER MVCC-safe.
This commit is contained in:
Tom Lane 2008-01-15 21:20:28 +00:00
parent ac12412ede
commit 14e2a260a5
1 changed files with 8 additions and 1 deletions
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9
src/backend/commands/cluster.c
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@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/cluster.c,v 1.167 2008/01/02 23:34:42 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/cluster.c,v 1.168 2008/01/15 21:20:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -751,6 +751,13 @@ copy_heap_data(Oid OIDNewHeap, Oid OIDOldHeap, Oid OIDOldIndex)
vacuum_set_xid_limits(-1, OldHeap->rd_rel->relisshared,
&OldestXmin, &FreezeXid);
/*
* FreezeXid will become the table's new relfrozenxid, and that mustn't
* go backwards, so take the max.
*/
if (TransactionIdPrecedes(FreezeXid, OldHeap->rd_rel->relfrozenxid))
FreezeXid = OldHeap->rd_rel->relfrozenxid;
/* Initialize the rewrite operation */
rwstate = begin_heap_rewrite(NewHeap, OldestXmin, FreezeXid, use_wal);