From: Tom Lane <tgl@sss.pgh.pa.us>
To: Franck Routier <franck.routier@axege.com>
cc: pgsql-performance@postgresql.org
Subject: Re: long lasting select, no io nor cpu usage ?
In-reply-to: <532AF271.4040903@axege.com>
References: <532AF271.4040903@axege.com>
Comments: In-reply-to Franck Routier <franck.routier@axege.com>
 message dated "Thu, 20 Mar 2014 14:51:45 +0100"
Date: Thu, 20 Mar 2014 09:56:25 -0400
Message-ID: <2042.1395323785@sss.pgh.pa.us>
Precedence: bulk
Sender: pgsql-performance-owner@postgresql.org

Franck Routier <franck.routier@axege.com> writes:
> I am doing a select, that did not finish after some 15 hours... Select
> is as follows:

> select * from sanact where sanact___rfovsnide = 'MYVERSION' order by
> sanactcsu;

> There is an index on sanact___rfovsnide and doing EXPLAIN shows it is used.
> Resulting dataset should be 1626000 rows.

> iostat shows 99.5% idle disks, almost no activity.
> top shows almost no cpu usage.

> Where should I be looking for a problem ?

pg_locks, probably.

			regards, tom lane


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