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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Carol Walter <walterc@indiana.edu>
Cc: Scott Marlowe <scott.marlowe@gmail.com>
Cc: Tena Sakai <tsakai@gallo.ucsf.edu>
Cc: pgsql-admin@postgresql.org
Subject: Re: Missing pg_clog files
Date: Wed, 24 Sep 2008 11:53:37 -0400
Message-ID: <5071.1222271617@sss.pgh.pa.us> (raw)
In-Reply-To: <F6EE2346-B706-43CC-947D-B3E27F34B7E4@indiana.edu>
References: <CA701605-BE56-416C-9034-789B20180281@indiana.edu>
	<FE44E0D7EAD2ED4BB2165071DB8E328C0378F509@egcrc-ex01.egcrc.org>
	<1B5F9FC4-578A-44FA-8264-FC674CF5A0FD@indiana.edu>
	<dcc563d10809231656xe8d199eh3093f959e88cc7de@mail.gmail.com>
	<FE44E0D7EAD2ED4BB2165071DB8E328C0378F50E@egcrc-ex01.egcrc.org>
	<20080923215948.m743u3mtcwg88s4o@webmail.iu.edu>
	<dcc563d10809232005i533433d9xde8f515f0f382c26@mail.gmail.com>
	<E22168D9-DDAD-4EE0-8CB9-8CA79FB26721@indiana.edu>
	<FE44E0D7EAD2ED4BB2165071DB8E328C0378F512@egcrc-ex01.egcrc.org>
	<dcc563d10809232121y47e27c32u94effea9809e494d@mail.gmail.com>
	<20080924071308.8lficujqsck8w44w@webmail.iu.edu>
	<052D4170-A065-4DDB-9F9D-6318E42C23BA@indiana.edu>
	<29313.1222261821@sss.pgh.pa.us>
	<F6EE2346-B706-43CC-947D-B3E27F34B7E4@indiana.edu>

Carol Walter <walterc@indiana.edu> writes:
> Here is the results of the query you asked for.

>       datname      | datfrozenxid
> ------------------+--------------
>   postgres         |          524
>   ...

Huh.  Postgres should never have removed any of those files with
datfrozenxid this low.  So it seems we have two possible explanations:
* there's something subtly wrong with the TruncateCLOG logic
* the files were removed by something else, ie, human error or
  operating-system failure

			regards, tom lane



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