Message-ID: <4C37A9C1.1060405@2ndquadrant.com>
Date: Fri, 09 Jul 2010 23:59:13 +0100
From: Greg Smith <greg@2ndquadrant.com>
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To: Matthew Wakeling <matthew@flymine.org>
CC: Kevin Grittner <Kevin.Grittner@wicourts.gov>,
	Brad Nicholson <bnichols@ca.afilias.info>,
	pgsql-performance@postgresql.org, Tom Lane <tgl@sss.pgh.pa.us>
Subject: Re: Need help in performance tuning.
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Matthew Wakeling wrote:
> If you have an external pool solution, you can put it somewhere else - 
> maybe on multiple somewhere elses.

This is the key point to observe:  if you're at the point where you have 
so many connections that you need a pool, the last place you want to put 
that is on the overloaded database server itself.  Therefore, it must be 
an external piece of software to be effective, rather than being part of 
the server itself.  Database servers are relatively expensive computing 
hardware due to size/quantity/quality of disks required.  You can throw 
a pooler (or poolers) on any cheap 1U server.  This is why a built-in 
pooler, while interesting, is not particularly functional for how people 
normally scale up real-world deployments.

-- 
Greg Smith  2ndQuadrant US  Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com   www.2ndQuadrant.us