diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2007-02-09 03:35:35 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2007-02-09 03:35:35 +0000 |
| commit | c398300330cb3060d50652800dbd12729ab9f5ef (patch) | |
| tree | 53d16880d6a38ffe3f6ddd125d644e1e984d14d1 /src/backend/access/transam/xact.c | |
| parent | acb3416686d44885b6f7d40daacb8e4c1a28e366 (diff) | |
Combine cmin and cmax fields of HeapTupleHeaders into a single field, by
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.
Diffstat (limited to 'src/backend/access/transam/xact.c')
| -rw-r--r-- | src/backend/access/transam/xact.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c index 26a3c5ddc2c..ab8b5fd8b4e 100644 --- a/src/backend/access/transam/xact.c +++ b/src/backend/access/transam/xact.c @@ -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); |