Re: FKs and deadlocks

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Philippe Lang" <philippe(dot)lang(at)attiksystem(dot)ch>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: FKs and deadlocks
Date: 2004-10-25 14:15:53
Message-ID: 18257.1098713753@sss.pgh.pa.us
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"Philippe Lang" <philippe(dot)lang(at)attiksystem(dot)ch> writes:
> I got a deadlock in my database this morning.

There is no deadlock here. The ungranted rows in pg_locks all point to
the transaction ID 6489299, which belongs to PID 11346, which is this
one:

> 11346 ?? R 236:43.23 postmaster: jlroubaty groupefpdb 172.17.10.14 UPDATE (postgres)

An UPDATE that churns for hours and hours may well represent a bug in
your application (unconstrained join maybe?) but it's not a deadlock.

regards, tom lane

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