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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Heikki Linnakangas <heikki@enterprisedb.com>
Cc: Decibel! <decibel@decibel.org>
Cc: Greg Smith <gsmith@gregsmith.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: I/O on select count(*)
Date: Mon, 26 May 2008 11:36:57 -0400
Message-ID: <21814.1211816217@sss.pgh.pa.us> (raw)
In-Reply-To: <483AB515.5050201@enterprisedb.com>
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	<483AB515.5050201@enterprisedb.com>

"Heikki Linnakangas" <heikki@enterprisedb.com> writes:
> Decibel! wrote:
>> Also, Simon and Tom had an idea at PGCon: Don't set hint-bits in the 
>> back-end if the page isn't already dirty. 

> Or even better: set the hint-bits, but don't dirty the page.

Which in fact is what Simon suggested, not the other thing.

			regards, tom lane



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