PG9.2.3. Query hanging: SELECT count(*) FROM pg_catalog.pg_class...

From: David Kerr <dmk(at)mr-paradox(dot)net>
To: pgsql-general(at)postgresql(dot)org
Subject: PG9.2.3. Query hanging: SELECT count(*) FROM pg_catalog.pg_class...
Date: 2013-02-15 21:58:55
Message-ID: 20130215215854.GA73541@mr-paradox.net
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Howdy!

This query is coming from PgPool I believe.

SELECT count(*) FROM pg_catalog.pg_class AS c WHERE c.relname = 'import_jobs' AND c.relpersistence = 'u'

This is a very small database, like 10/15 tables, it's basically empty.
If i run this query manually, it comes back immediatly.
However according to this it's been running for about an hour.

v3=# select now();
now
-------------------------------
2013-02-15 21:49:34.470466+00
(1 row)

-[ RECORD 5 ]----+---------------------------------------------------------------------------------------------------------
datid | 16389
datname | v3
pid | 13905
usesysid | 20415
usename | workling
application_name |
client_addr | 10.0.0.132
client_hostname |
client_port | 58009
backend_start | 2013-02-15 20:49:09.098768+00
xact_start | 2013-02-15 20:49:09.189625+00
query_start | 2013-02-15 20:49:09.198742+00
state_change | 2013-02-15 20:49:09.198743+00
waiting | f
state | active
query | SELECT count(*) FROM pg_catalog.pg_class AS c WHERE c.relname = 'import_jobs' AND c.relpersistence = 'u'

(I actually restarted the application and now there are 4 of these)

Any idea why the query would hang like this?

I don't see it waiting on locks or anything like that.

any ideas?

Thanks

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