Postgres log(pg_logs) have lots of message

From: Nik Tek <niktek2005(at)gmail(dot)com>
To: pgsql-performance(at)postgresql(dot)org, pgsql-admin(at)postgresql(dot)org
Subject: Postgres log(pg_logs) have lots of message
Date: 2013-04-10 21:58:11
Message-ID: CAHySzWXT5RF30cFOARSq1HqNxO7v0TBuigWaV4NedEtwWrda=Q@mail.gmail.com
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Hi,

Could some please explain what these warnings mean in postgres.
I see these messages a lot when automatic vacuum runs.

1 tm:2013-04-10 11:39:20.074 UTC db: pid:13766 LOG: automatic vacuum
of table "DB1.nic.pvxt": could not (re)acquire exclusive lock for truncate
scan
1 tm:2013-04-10 11:40:22.849 UTC db: pid:14286 LOG: automatic vacuum
of table "DB1.nic.pvxt": could not (re)acquire exclusive lock for truncate
scan
1 tm:2013-04-10 11:41:17.500 UTC db: pid:14491 LOG: automatic vacuum
of table "DB1.nic.pvxt": could not (re)acquire exclusive lock for truncate
scan

Thank you
Nik

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