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Combine cmin and cmax fields of HeapTupleHeaders into a single field, by

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keeping private state in each backend that has inserted and deleted the same
tuple during its current top-level transaction.  This is sufficient since
there is no need to be able to determine the cmin/cmax from any other
transaction.  This gets us back down to 23-byte headers, removing a penalty
paid in 8.0 to support subtransactions.  Patch by Heikki Linnakangas, with
minor revisions by moi, following a design hashed out awhile back on the
pghackers list.
This commit is contained in:
Tom Lane
2007-02-09 03:35:35 +00:00
parent acb3416686
commit c398300330
21 changed files with 799 additions and 127 deletions
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8
src/backend/access/transam/xact.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.233 2007/02/07 23:11:29 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.234 2007/02/09 03:35:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -38,11 +38,12 @@
#include "storage/lmgr.h"
#include "storage/procarray.h"
#include "storage/smgr.h"
#include "utils/combocid.h"
#include "utils/flatfiles.h"
#include "utils/guc.h"
#include "utils/inval.h"
#include "utils/memutils.h"
#include "utils/relcache.h"
#include "utils/guc.h"
/*
@ -1628,6 +1629,7 @@ CommitTransaction(void)
AtEOXact_Namespace(true);
/* smgrcommit already done */
AtEOXact_Files();
AtEOXact_ComboCid();
pgstat_clear_snapshot();
pgstat_count_xact_commit();
pgstat_report_txn_timestamp(0);
@ -1845,6 +1847,7 @@ PrepareTransaction(void)
AtEOXact_Namespace(true);
/* smgrcommit already done */
AtEOXact_Files();
AtEOXact_ComboCid();
pgstat_clear_snapshot();
CurrentResourceOwner = NULL;
@ -1997,6 +2000,7 @@ AbortTransaction(void)
AtEOXact_Namespace(false);
smgrabort();
AtEOXact_Files();
AtEOXact_ComboCid();
pgstat_clear_snapshot();
pgstat_count_xact_rollback();
pgstat_report_txn_timestamp(0);