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From: Ivan Voras <ivoras@freebsd.org>
To: pgsql-performance@postgresql.org
Subject: Re: Slow "Select count(*) ..." query on table with    60 Mio. rows
Date: Thu, 14 Jan 2010 16:59:57 +0100
Message-ID: <hinf1q$qop$1@ger.gmane.org> (raw)
In-Reply-To: <4B4EE849020000250002E4A4@gw.wicourts.gov>
References: <4B4EE849020000250002E4A4@gw.wicourts.gov>

Kevin Grittner wrote:
> Matthew Wakeling <matthew@flymine.org> wrote:
>  
>> This is an FAQ.
>  
> I just added it to the wiki FAQ page:
>  
> http://wiki.postgresql.org/wiki/FAQ#Why_is_.22SELECT_count.28.2A.29_FROM_bigtable.3B.22_slow.3F

Maybe you could add a short note why an estimation like from the 
pg_class table is usually enough.

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