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From: Pavan Deolasee <pavan.deolasee@gmail.com>
To: Gauri Kanekar <meetgaurikanekar@gmail.com>
Cc: Shane Ambler <pgsql@sheeky.biz>
Cc: Alvaro Herrera <alvherre@commandprompt.com>
Cc: Greg Smith <gsmith@gregsmith.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Replication Syatem
Date: Wed, 30 Apr 2008 12:55:30 +0530
Message-ID: <2e78013d0804300025j10567a82x5845ab8bc3d4f2a2@mail.gmail.com> (raw)
In-Reply-To: <7e4ba9550804292346r46aa55e7g6cf1f731b6be7d40@mail.gmail.com>
References: <7e4ba9550804280638ie81dc23w472785c83cd38fcf@mail.gmail.com>
	<Pine.GSO.4.64.0804290347560.20575@westnet.com>
	<7e4ba9550804290405i4c0d3a57x1640239c9995c13@mail.gmail.com>
	<20080429130204.GA5652@alvh.no-ip.org>
	<4817514A.3060704@Sheeky.Biz>
	<7e4ba9550804292229x82e74e5y355349866c72245c@mail.gmail.com>
	<2e78013d0804292237l4c74a166u4ab082901aa0804f@mail.gmail.com>
	<7e4ba9550804292239n668b1f01v59ad7ac6ca9e092b@mail.gmail.com>
	<2e78013d0804292343hd9d1c0lf93df68e559f9af3@mail.gmail.com>
	<7e4ba9550804292346r46aa55e7g6cf1f731b6be7d40@mail.gmail.com>

On Wed, Apr 30, 2008 at 12:16 PM, Gauri Kanekar
<meetgaurikanekar@gmail.com> wrote:
> fillfactor is set to 80 as you suggested.
> delta* fields r updated and these fields are no where related to any of the
> index fields.
>

That's weird. With that fillfactor, you should have a very high
percentage of HOT update ratio. It could be a very special case that
we might be looking at. I think a self contained test case or a very
detail explanation of the exact usage is what we need to explain this
behavior. You may also try dropping non-critical indexes and test
again.

Btw, I haven't been able to reproduce this at my end. With the given
indexes and kind of updates, I get very high percentage of HOT
updates.

Thanks,
Pavan

-- 
Pavan Deolasee
EnterpriseDB     http://www.enterprisedb.com



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