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Commitdfed001

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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 partof an update chain. Those still keep their original markings.This patch makes it possible for CLUSTER to advance relfrozenxid, thus avoidingthe need of vacuuming the table for Xid wraparound purposes. That will bepatched separately.Patch from Heikki Linnakangas.
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‎src/backend/access/heap/rewriteheap.c

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@@ -96,7 +96,7 @@
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* Portions Copyright (c) 1994-5, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/access/heap/rewriteheap.c,v 1.3 2007/04/17 21:29:31 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/access/heap/rewriteheap.c,v 1.4 2007/05/16 16:36:56 alvherre Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -538,6 +538,8 @@ raw_heap_insert(RewriteState state, HeapTuple tup)
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OffsetNumbernewoff;
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HeapTupleheaptup;
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heap_freeze_tuple(tup->t_data,state->rs_oldest_xmin,InvalidBuffer);
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/*
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* If the new tuple is too big for storage or contains already toasted
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* out-of-line attributes from some other relation, invoke the toaster.

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