From: Simon Riggs <simon@2ndQuadrant.com>
Date: Thu, 1 Oct 2009 15:11:51 +0000 (+0100)
Subject: Do GetRunningTransactionData() immediately prior to a shutdown checkpoint.
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=89fbde318f80bdb2fab19433ed3574da1a348977;p=users%2Fsimon%2Fpostgres.git

Do GetRunningTransactionData() immediately prior to a shutdown checkpoint.
---

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 51280c63c6..a8b2565897 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -7060,6 +7060,15 @@ ShutdownXLOG(int code, Datum arg)
 		CreateRestartPoint(CHECKPOINT_IS_SHUTDOWN | CHECKPOINT_IMMEDIATE);
 	else
 	{
+		/*
+		 * Take a snapshot of running transactions and write this to WAL.
+		 * This allows us to reconstruct the state of running transactions
+		 * during archive recovery, if required. We do this even if we are
+		 * not archiving, to allow a cold physical backup of the server to
+		 * be useful as a read only standby.
+		 */
+		GetRunningTransactionData();
+
 		/*
 		 * If archiving is enabled, rotate the last XLOG file so that all the
 		 * remaining records are archived (postmaster wakes up the archiver