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Re: Postgres clustering?

From: "Keith Bottner" <kbottner(at)comcast(dot)net>
To: <pgsql-general(at)linuxinternet(dot)org>, <pgsql-general(at)postgresql(dot)org>
Subject: Re: Postgres clustering?
Date: 2004-02-26 21:22:02
Message-ID: 00e801c3fcae$93c70a70$7d00a8c0@juxtapose (view raw, whole thread or download thread mbox)
Lists: pgsql-general
There currently is no solution as I have asked this question quite a few
times in the past. The best solution that exists for Postgres is
master/slave asynchronous replication which is not what you want.

I am very interested in a similar solution and believe that I could get some
resources from my company for implementing such a system. Are you interested
in helping to develop the functionality for Postgres?

Is anybody else in the Postgres world even interested in pursuing this
functionality set in more than lip service? Are there any currently active
Postgres projects out there trying to achieve this?

Is there any activity on the replication issues that appear on the TODO
Postgres list at If so who is
working on them so I can contact them?

Feedback on these topics would be appreciated.


-----Original Message-----
From: pgsql-general-owner(at)postgresql(dot)org
[mailto:pgsql-general-owner(at)postgresql(dot)org] On Behalf Of warwick.poole
Sent: Thursday, February 26, 2004 2:41 PM
To: pgsql-general(at)postgresql(dot)org
Subject: [GENERAL] Postgres clustering?

I am interested in finding out about Enterprise scale Postgres installations
and clustering, especially on Linux.

Essentially I would like to know the possibility that Postgres can store the
database data in a central location (ex: on a SAN fiber array) and have a
cluster of machines sharing processor/RAM/IO bandwidth to do the application
processing. Or perhaps there is another solution similar to what have developed for MySQL where the 'cluster' seems to
be really a set of individual MySQL servers that syncronize their data at a
very high speed?

I have found from my investigations that the usual Linux cluster tools, like
Beowulf/Mosix/openMosix/Alinka/Qlusters dont support Postgres and similar
apps because of the shared memory or other issues. The complexity of RDBMS
transactions seems to have limited parallel processing in this field to the
big (read: EXPENSIVE) guys like Oracle and IBM. 

Does anyone know of a technique to centralize the Postgres data storage and
farm out the processor/RAM/IO needs to a scalable resource? It seems like it
should be able to be done, but at the moment its looking to me like the
choice looks like this:

- Buy bigger and bigger hardware to run Postgres. 
- Fork out large sums of money and port applications to Oracle or DB2
Anyone have any success with OpenSource tools for this or similar issues?


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