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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Gauri Kanekar <meetgaurikanekar@gmail.com>
Cc: Jonah H. Harris <jonah.harris@gmail.com>
Cc: Devrim GÜNDÜZ <devrim@gunduz.org>
Cc: pgsql-performance@postgresql.org
Subject: Re: Hot Issue
Date: Wed, 02 Jul 2008 12:35:31 -0400
Message-ID: <12784.1215016531@sss.pgh.pa.us> (raw)
In-Reply-To: <7e4ba9550807020748r5b4749c2i6148d62573722368@mail.gmail.com>
References: <7e4ba9550807020531w5480956fs2a1b5b630babda41@mail.gmail.com>
	<1215004084.2842.32.camel@laptop.gunduz.org>
	<7e4ba9550807020611x3dac7fffw8497d168c7a0e9d8@mail.gmail.com>
	<36e682920807020629h2b0432e9k39cc01f1693e6a40@mail.gmail.com>
	<7e4ba9550807020644j4f41530axd43317c7f180faed@mail.gmail.com>
	<36e682920807020721s3e537ef8k3189c8ce3b47e6c7@mail.gmail.com>
	<11126.1215009603@sss.pgh.pa.us>
	<7e4ba9550807020748r5b4749c2i6148d62573722368@mail.gmail.com>

"Gauri Kanekar" <meetgaurikanekar@gmail.com> writes:
> Better HOT performance means.... 1st stat showed most of the updated tuples
> getting hot.
> But the 2nd stat showed that most of the updated tuples are NOT getting hot.

Well, as was noted upthread, you'd want to reduce the table fillfactor
(not index fillfactor) below 100 to improve the odds of being able to
do HOT updates.  But I wonder whether your application behavior changed.
Are you updating the rows in a way that'd make them wider?

			regards, tom lane



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