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Re: Constant WAL replay
- From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
- To: "Joshua D. Drake" <jd(at)commandprompt(dot)com>
- Cc: Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>, Hans-Jürgen Schönig <postgres(at)cybertec(dot)at>, pgsql-hackers(at)postgresql(dot)org, eg(at)cybertec(dot)at
- Subject: Re: Constant WAL replay
- Date: Sun, 24 Apr 2005 18:48:04 -0400 (EDT)
- Message-id: <200504242248(dot)j3OMm4602985(at)candle(dot)pha(dot)pa(dot)us>
Joshua D. Drake wrote: > Alvaro Herrera wrote: > > On Sun, Apr 24, 2005 at 08:10:34AM +0200, Hans-J?rgen Sch?nig wrote: > > > > > >>The idea: We are looking for a way to implement a synchronous > >>single-master / multiple slaves systems. > >>Meanwhile we are able to serialize / deserialize WAL records and send > >>them to a group communication system which transports those records to > >>the slave database. > >>This is not hard to do. > > > > > > In fact, I believe Command Prompt's Mammoth Replicator does exactly > > this. > > Very close. We don't use the WAL (yet, slated for probably 8.1) but we > do use a transaction log shipping method. So the implementation is > almost the same. Can you run queries on the slave? If so, how do you handle xid collisions? -- Bruce Momjian | http://candle.pha.pa.us pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073
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