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Re: I/O on select count(*)

From: Simon Riggs <simon(at)2ndquadrant(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, Decibel! <decibel(at)decibel(dot)org>, Greg Smith <gsmith(at)gregsmith(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: I/O on select count(*)
Date: 2008-05-27 20:54:26
Message-ID: 1211921666.4489.261.camel@ebony.site (view raw or flat)
Thread:
Lists: pgsql-performance
On Mon, 2008-05-26 at 11:36 -0400, Tom Lane wrote:
> "Heikki Linnakangas" <heikki(at)enterprisedb(dot)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.

Just raised this on -hackers, BTW. 

-- 
 Simon Riggs           www.2ndQuadrant.com
 PostgreSQL Training, Services and Support


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