From dfed0012bc03c3cda94e75af54e9c774556c9787 Mon Sep 17 00:00:00 2001 From: Alvaro Herrera Date: Wed, 16 May 2007 16:36:56 +0000 Subject: [PATCH] Have the rewriteheap code freeze old tuples. This is safe because it is only applied to live tuples older than a recent Xmin, not to tuples that may be part of an update chain. Those still keep their original markings. This patch makes it possible for CLUSTER to advance relfrozenxid, thus avoiding the need of vacuuming the table for Xid wraparound purposes. That will be patched separately. Patch from Heikki Linnakangas. --- src/backend/access/heap/rewriteheap.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/backend/access/heap/rewriteheap.c b/src/backend/access/heap/rewriteheap.c index 96d6d6f2c0..be389c647a 100644 --- a/src/backend/access/heap/rewriteheap.c +++ b/src/backend/access/heap/rewriteheap.c @@ -96,7 +96,7 @@ * Portions Copyright (c) 1994-5, Regents of the University of California * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/access/heap/rewriteheap.c,v 1.3 2007/04/17 21:29:31 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/access/heap/rewriteheap.c,v 1.4 2007/05/16 16:36:56 alvherre Exp $ * *------------------------------------------------------------------------- */ @@ -538,6 +538,8 @@ raw_heap_insert(RewriteState state, HeapTuple tup) OffsetNumber newoff; HeapTuple heaptup; + heap_freeze_tuple(tup->t_data, state->rs_oldest_xmin, InvalidBuffer); + /* * If the new tuple is too big for storage or contains already toasted * out-of-line attributes from some other relation, invoke the toaster. -- 2.40.0