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From: Greg Smith <greg@2ndquadrant.com>
To: Max Williams <Max.Williams@mflow.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Large (almost 50%!) performance drop after	 upgrading to 8.4.4?
Date: Thu, 10 Jun 2010 16:15:44 -0400
Message-ID: <4C1147F0.2090607@2ndquadrant.com> (raw)
In-Reply-To: <0357196CB603794BB76F4F6B373F27330506EACE56@SERVER.ddnglobal.local>
References: <0357196CB603794BB76F4F6B373F27330506EACE45@SERVER.ddnglobal.local>
	<AANLkTilfB0IIBqN8MG_vCPDba0R2NxcXgjIM7Axj61wM@mail.gmail.com>
	<1276158598.5764.22.camel@hp-laptop2.gunduz.org>
	<0357196CB603794BB76F4F6B373F27330506EACE51@SERVER.ddnglobal.local>
	<15383.1276179056@sss.pgh.pa.us>
	<0357196CB603794BB76F4F6B373F27330506EACE55@SERVER.ddnglobal.local>
	<4C10BB59020000250003214A@gw.wicourts.gov>
	<0357196CB603794BB76F4F6B373F27330506EACE56@SERVER.ddnglobal.local>

Max Williams wrote:
> Can I just turn this off on 8.4.4 or is it a compile time option

You can update your postgresql.conf to include:

debug_assertions = false

And restart the server.  This will buy you back *some* of the 
performance loss but not all of it.  Will have to wait for corrected 
packaged to make the issue completely go away.

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

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