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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.
This commit is contained in:
Alvaro Herrera 2007-05-16 16:36:56 +00:00
parent d365ce1f5c
commit dfed0012bc
1 changed files with 3 additions and 1 deletions
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4
src/backend/access/heap/rewriteheap.c
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@ -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.