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Move the tuple freezing point in CLUSTER to a point further back in the past,

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to avoid losing useful Xid information in not-so-old tuples.  This makes
CLUSTER behave the same as VACUUM as far a tuple-freezing behavior goes
(though CLUSTER does not yet advance the table's relfrozenxid).

While at it, move the actual freezing operation in rewriteheap.c to a more
appropriate place, and document it thoroughly.  This part of the patch from
Tom Lane.
This commit is contained in:
Alvaro Herrera
2007-05-17 15:28:29 +00:00
parent 90cbc63fd1
commit 3b0347b36e
6 changed files with 44 additions and 21 deletions
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7
src/include/access/rewriteheap.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/rewriteheap.h,v 1.1 2007/04/08 01:26:33 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/rewriteheap.h,v 1.2 2007/05/17 15:28:29 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@@ -20,10 +20,11 @@
typedef struct RewriteStateData *RewriteState;
extern RewriteState begin_heap_rewrite(Relation NewHeap,
TransactionId OldestXmin, bool use_wal);
TransactionId OldestXmin, TransactionId FreezeXid,
bool use_wal);
extern void end_heap_rewrite(RewriteState state);
extern void rewrite_heap_tuple(RewriteState state, HeapTuple oldTuple,
HeapTuple newTuple);
HeapTuple newTuple);
extern void rewrite_heap_dead_tuple(RewriteState state, HeapTuple oldTuple);
#endif /* REWRITE_HEAP_H */