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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: Mon, 18 Dec 2006 13:00:55 -0500
Message-ID: <19298.1166464855@sss.pgh.pa.us> (raw)
In-Reply-To: <357fa7590612180951q3da4c840l27caa82475444cfb@mail.gmail.com>
References: <357fa7590612130844q58ef3ca5q31e164f9b006e0fc@mail.gmail.com>
	<25209.1166131396@sss.pgh.pa.us>
	<357fa7590612150821i3eca3f66ge2ced1ee20fa2dac@mail.gmail.com>
	<11651.1166202586@sss.pgh.pa.us>
	<357fa7590612150955g1b9c733duaf000c23d28aa8af@mail.gmail.com>
	<12508.1166206006@sss.pgh.pa.us>
	<357fa7590612151026t4ae033f6w5367cac9d0b67064@mail.gmail.com>
	<13947.1166209788@sss.pgh.pa.us>
	<357fa7590612151121x5f95102fj21a96b1bdc7eb002@mail.gmail.com>
	<20792.1166211026@sss.pgh.pa.us>
	<357fa7590612180951q3da4c840l27caa82475444cfb@mail.gmail.com>

"Steven Flatt" <steven.flatt@gmail.com> writes:
> I can fix this problem by using CREATE TEMP TABLE ... LIKE instead of CREATE
> TEMP TABLE ... AS.

That seems ... um ... bizarre.  Now are you able to put together a
self-contained test case?  Seems like we could have two independent bugs
here: first, why (and how) is the temp table different, and second how
does that result in the observed performance problem.

			regards, tom lane



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