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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Pavan Deolasee <pavan.deolasee@gmail.com>
Cc: Cédric Villemain <cedric.villemain.debian@gmail.com>
Cc: Greg Stark <gsstark@mit.edu>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: Florian Helmberger <fh@25th-floor.com>
Cc: Alvaro Herrera <alvherre@commandprompt.com>
Cc: pgsql-hackers@postgresql.org
Subject: Re: [ADMIN] pg_class reltuples/relpages not updated by autovacuum/vacuum
Date: Sun, 29 May 2011 11:57:01 -0400
Message-ID: <21060.1306684621@sss.pgh.pa.us> (raw)
In-Reply-To: <BANLkTi=ONrsOoMD3rOdPjRnKPrirKE+fpg@mail.gmail.com>
References: <4DD28F73.6010108@25th-floor.com>
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	<BANLkTi=! ONrsOoMD3rOdPjRnKPrirKE+fpg@mail.gmail.com>

Pavan Deolasee <pavan.deolasee@gmail.com> writes:
> On Sun, May 29, 2011 at 8:10 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> That would require proof, not just suggestion.  Skipping pages will
>> defeat the OS read-ahead algorithm, and so could easily cost more than
>> reading them.

> My worry is what we have right now is also based on just assumptions
> and gut feelings rather than any numbers.

So go collect some numbers.

			regards, tom lane



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  Cc: tgl@sss.pgh.pa.us, pavan.deolasee@gmail.com, cedric.villemain.debian@gmail.com, gsstark@mit.edu, robertmhaas@gmail.com, Kevin.Grittner@wicourts.gov, fh@25th-floor.com, alvherre@commandprompt.com, pgsql-hackers@postgresql.org
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