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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Steven Flatt <steven.flatt@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Insertion to temp table deteriorating over time
Date: Fri, 15 Dec 2006 13:06:46 -0500
Message-ID: <12508.1166206006@sss.pgh.pa.us> (raw)
In-Reply-To: <357fa7590612150955g1b9c733duaf000c23d28aa8af@mail.gmail.com>
References: <357fa7590612130844q58ef3ca5q31e164f9b006e0fc@mail.gmail.com>
	<9315.1166030958@sss.pgh.pa.us>
	<357fa7590612131517q375fc0by50cb4257bcce7a94@mail.gmail.com>
	<13032.1166052447@sss.pgh.pa.us>
	<357fa7590612141240t55e70695q770a05a68a67536c@mail.gmail.com>
	<25209.1166131396@sss.pgh.pa.us>
	<357fa7590612150821i3eca3f66ge2ced1ee20fa2dac@mail.gmail.com>
	<11651.1166202586@sss.pgh.pa.us>
	<357fa7590612150955g1b9c733duaf000c23d28aa8af@mail.gmail.com>

"Steven Flatt" <steven.flatt@gmail.com> writes:
> Our application is such that there is a great deal of activity at the
> beginning of the hour and minimal activity near the end of the hour.

OK ...

> The truncate and re-fill process is done once per hour, at the end of the
> high-load cycle, so I doubt that's even a big contributor to the number of
> removable rows in pg_class.

Oh, then where *are* the removable rows coming from?  At this point I
think that the truncate/refill thing is not the culprit, or at any rate
is only one part of a problematic usage pattern that we don't see all of
yet.

			regards, tom lane

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