From e61d2521520626cb7744163c02c79e9d2230a3bc Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Tue, 16 Oct 2007 02:48:57 +0000
Subject: [PATCH] Add mention of Slony for in-place upgrades.

---
 doc/src/sgml/backup.sgml | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/doc/src/sgml/backup.sgml b/doc/src/sgml/backup.sgml
index 5e8549a2c0..f8ca2b5c48 100644
--- a/doc/src/sgml/backup.sgml
+++ b/doc/src/sgml/backup.sgml
@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/backup.sgml,v 2.103 2007/09/29 01:36:10 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/backup.sgml,v 2.104 2007/10/16 02:48:57 momjian Exp $ -->
 
 <chapter id="backup">
  <title>Backup and Restore</title>
@@ -1740,6 +1740,16 @@ pg_dumpall -p 5432 | psql -d postgres -p 6543
    access.
   </para>
 
+  <para>
+   It is also possible to use <productname>Slony</> to create a slave
+   server with the updated version of <productname>PostgreSQL</>.  The
+   slave can be on the same computer or a different computer.  Once it
+   has synced up with the master server (running the older version of
+   <productname>PostgreSQL</>), you can switch masters and make the slave
+   the master and shut down the older database instance.  Such a
+   switch-over results in only several minutes of downtime for an upgrade.
+  </para>
+
   <para>
    In practice you probably want to test your client
    applications on the new setup before switching over completely.