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Change the timestamps recorded in transaction commit/abort xlog records

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from time_t to TimestampTz representation.  This provides full gettimeofday()
resolution of the timestamps, which might be useful when attempting to
do point-in-time recovery --- previously it was not possible to specify
the stop point with sub-second resolution.  But mostly this is to get
rid of TimestampTz-to-time_t conversion overhead during commit.  Per my
proposal of a day or two back.
This commit is contained in:
Tom Lane
2007-04-30 21:01:53 +00:00
parent 641912b4d1
commit c432061963
7 changed files with 67 additions and 42 deletions
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6
src/include/access/xact.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.86 2007/04/30 03:23:49 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.87 2007/04/30 21:01:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -81,7 +81,7 @@ typedef void (*SubXactCallback) (SubXactEvent event, SubTransactionId mySubid,
typedef struct xl_xact_commit
{
time_t xtime;
TimestampTz xact_time; /* time of commit */
int nrels; /* number of RelFileNodes */
int nsubxacts; /* number of subtransaction XIDs */
/* Array of RelFileNode(s) to drop at commit */
@@ -93,7 +93,7 @@ typedef struct xl_xact_commit
typedef struct xl_xact_abort
{
time_t xtime;
TimestampTz xact_time; /* time of abort */
int nrels; /* number of RelFileNodes */
int nsubxacts; /* number of subtransaction XIDs */
/* Array of RelFileNode(s) to drop at abort */

4
src/include/access/xlog_internal.h
View File

@@ -11,7 +11,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog_internal.h,v 1.19 2007/03/03 20:02:27 momjian Exp $
* $PostgreSQL: pgsql/src/include/access/xlog_internal.h,v 1.20 2007/04/30 21:01:53 tgl Exp $
*/
#ifndef XLOG_INTERNAL_H
#define XLOG_INTERNAL_H
@@ -71,7 +71,7 @@ typedef struct XLogContRecord
/*
* Each page of XLOG file has a header like this:
*/
#define XLOG_PAGE_MAGIC 0xD05F /* can be used as WAL version indicator */
#define XLOG_PAGE_MAGIC 0xD061 /* can be used as WAL version indicator */
typedef struct XLogPageHeaderData
{