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From: Greg Smith <gsmith@gregsmith.com>
To: sathiya psql <sathiya.psql@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: count * performance issue
Date: Thu, 6 Mar 2008 08:18:17 -0500 (EST)
Message-ID: <Pine.GSO.4.64.0803060813570.11897@westnet.com> (raw)
In-Reply-To: <f966c2ee0803060443j3d9c1b66x5f59e00d084e841c@mail.gmail.com>
References: <f966c2ee0803052142l6a105678jfe2da92a0d9371@mail.gmail.com>
	<f966c2ee0803052143k4570d771o6c300647d3b987d@mail.gmail.com>
	<20080306060829.GA21084@a-kretschmer.de>
	<bf54be870803052215y5bb56235k5ea05ada1d701022@mail.gmail.com>
	<47CF8EA6.8070503@mark.mielke.cc>
	<20080306063643.GB21084@a-kretschmer.de>
	<f966c2ee0803052243w723e2866gbfc37128620d1c6d@mail.gmail.com>
	<B94D3180-BB72-43EB-BA1E-90CF53705386@fastcrypt.com>
	<f966c2ee0803060358k14dd7374h8ef3f4ca0818b04@mail.gmail.com>
	<3E9C3A51-C28E-4B75-9739-E344DAC72880@fastcrypt.com>
	<f966c2ee0803060443j3d9c1b66x5f59e00d084e841c@mail.gmail.com>

On Thu, 6 Mar 2008, sathiya psql wrote:

> is there any article saying the difference between this 7.3 and 8.4

I've collected a list of everything on this topic I've seen at 
http://www.postgresqldocs.org/index.php/Version_8.3_Changes

The Feature Matrix linked to there will be a quicker way to see what's 
happened than sorting through the release notes.

None of these changes change the fact that getting an exact count in this 
situation takes either a sequential scan or triggers.

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD



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