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This patch, which is built upon the "HeapTupleHeader accessor macros"

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patch from 2002-06-10, is supposed to reduce the heap tuple header size
by four bytes on most architectures.  Of course it changes the on-disk
tuple format and therefore requires initdb.

This overlays cmin/cmax/xmax fields into only two fields.

Manfred Koizar
This commit is contained in:
Bruce Momjian
2002-07-02 05:46:14 +00:00
parent 866103989d
commit 97bfffe50e
3 changed files with 90 additions and 31 deletions
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4
src/backend/access/heap/heapam.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.139 2002/06/20 20:29:24 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.140 2002/07/02 05:46:14 momjian Exp $
*
*
* INTERFACE ROUTINES
@ -2204,7 +2204,7 @@ heap_xlog_insert(bool redo, XLogRecPtr lsn, XLogRecord *record)
htup->t_infomask = HEAP_XMAX_INVALID | xlhdr.mask;
HeapTupleHeaderSetXmin(htup, record->xl_xid);
HeapTupleHeaderSetCmin(htup, FirstCommandId);
HeapTupleHeaderSetXmax(htup, InvalidTransactionId);
HeapTupleHeaderSetXmaxInvalid(htup);
HeapTupleHeaderSetCmax(htup, FirstCommandId);
offnum = PageAddItem(page, (Item) htup, newlen, offnum,