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Augment WAL records for btree delete with GetOldestXmin() to reduce

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false positives during Hot Standby conflict processing. Simple
patch to enhance conflict processing, following previous discussions.
Controlled by parameter minimize_standby_conflicts = on | off, with
default off allows measurement of performance impact to see whether
it should be set on all the time.
This commit is contained in:
Simon Riggs
2010-01-29 18:39:05 +00:00
parent d0cfc01823
commit 6d2bc0a6cf
6 changed files with 48 additions and 12 deletions
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3
src/include/access/xlog.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.99 2010/01/28 07:31:42 heikki Exp $
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.100 2010/01/29 18:39:05 sriggs Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -183,6 +183,7 @@ extern int XLogArchiveTimeout;
extern bool log_checkpoints;
extern bool XLogRequestRecoveryConnections;
extern int MaxStandbyDelay;
extern bool MinimizeStandbyConflicts;
#define XLogArchivingActive() (XLogArchiveMode)
#define XLogArchiveCommandSet() (XLogArchiveCommand[0] != '\0')