Received: from localhost (maia-4.hub.org [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id A42989FB4F6 for ; Wed, 18 Jul 2007 12:43:28 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 05478-05 for ; Wed, 18 Jul 2007 12:43:24 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.5 Received: from mail.metronet.co.uk (mail.metronet.co.uk [213.162.97.75]) by postgresql.org (Postfix) with ESMTP id 0AB0C9FB4EE for ; Wed, 18 Jul 2007 12:43:24 -0300 (ADT) Received: from server3.office.archonet.com (84-51-143-99.archon037.adsl.metronet.co.uk [84.51.143.99]) by smtp.metronet.co.uk (MetroNet Mail) with ESMTP id 0B193143F6F; Wed, 18 Jul 2007 16:43:17 +0100 (BST) Received: from [192.168.1.36] (dell36.office.archonet.com [192.168.1.36]) by server3.office.archonet.com (Postfix) with ESMTP id 91A7D274059; Wed, 18 Jul 2007 16:43:21 +0100 (BST) Message-ID: <469E3515.4070006@archonet.com> Date: Wed, 18 Jul 2007 16:43:17 +0100 From: Richard Huxton User-Agent: Thunderbird 2.0.0.0 (X11/20070326) MIME-Version: 1.0 To: Chris Browne Cc: pgsql-sql@postgresql.org Subject: Re: Database Synchronization References: <002d01c7c90b$48870560$d9951020$@com> <469DC124.8000704@archonet.com> <60fy3ln4ij.fsf@dba2.int.libertyrms.com> In-Reply-To: <60fy3ln4ij.fsf@dba2.int.libertyrms.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200707/116 X-Sequence-Number: 28851 Chris Browne wrote: > dev@archonet.com (Richard Huxton) writes: >> >> http://www.slony.info/ > But it is worth noting one thing about the synchronization... > > Slony-I's strategy is pretty simple: One node is considered the > "master," and the other node is forcibly made to conform to what is on > the master. > > If you want to synchronize back and forth (e.g. - multimaster > replication of some sort), Slony-I is not suitable... Except in the case when you can have separate tables for the data. If you have a london_sales table only updated in London and a paris_sales table only updated in Paris then you have something inching towards multi-master. -- Richard Huxton Archonet Ltd