From 6d2bc0a6cf5c8d9a3241a0d7afaf5ca8bf1f11ec Mon Sep 17 00:00:00 2001
From: Simon Riggs <simon@2ndQuadrant.com>
Date: Fri, 29 Jan 2010 18:39:05 +0000
Subject: Augment WAL records for btree delete with GetOldestXmin() to reduce
 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.

---
 doc/src/sgml/config.sgml | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

(limited to 'doc/src')

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 71097ee21c8..c8c30c98415 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.246 2010/01/26 16:33:40 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.247 2010/01/29 18:39:05 sriggs Exp $ -->
 
 <chapter Id="runtime-config">
   <title>Server Configuration</title>
@@ -1840,6 +1840,22 @@ archive_command = 'copy "%p" "C:\\server\\archivedir\\%f"'  # Windows
       </listitem>
      </varlistentry>
 
+     <varlistentry id="minimize-standby-conflicts" xreflabel="minimize_standby_conflicts">
+      <term><varname>minimize_standby_conflicts</varname> (<type>boolean</type>)</term>
+      <indexterm>
+       <primary><varname>minimize_standby_conflicts</> configuration parameter</primary>
+      </indexterm>
+      <listitem>
+       <para>
+        Generates additional information to the transaction log (WAL) to minimize
+        the number of false positive cancelations caused by recovery conflicts on
+        a standby server that consumes WAL data from this server.
+        There is additional performance cost to enabling this parameter.
+        Parameter has no effect during recovery, only in normal running.
+       </para>
+      </listitem>
+     </varlistentry>
+
      </variablelist>
     </sect2>
    </sect1>
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