From: Nicolas Zin <nicolas.zin@savoirfairelinux.com>
To: pgsql-admin@postgresql.org
Subject: select * from pg_stat_bgwriter slow
Date: Tue, 14 May 2013 16:57:06 -0400
Message-ID: <5192A522.3040002@savoirfairelinux.com> (raw)
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-admin>
Hi,
we have a postgresql 9.0, I setup collectd to gather some information.
It frequently ask the database about the bgwriter state by requesting
"select * from pg_stat_bgwriter" (among other stats).
It seems that this requets takes 6-7s to answer and in the log we got
"pgstat timeout"
Note: The database is constantly loaded with insert (but not overloaded).
Does someone have an idea why such request can take so long to answer. I
was thinking bgwriter stats is just a matter of picking global info in
memory. Can it be due to locks of some sort ?
Cordialy,
Nicolas Zin
--
Sent via pgsql-admin mailing list (pgsql-admin@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-admin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-admin@postgresql.org
Cc: nicolas.zin@savoirfairelinux.com
Subject: Re: select * from pg_stat_bgwriter slow
In-Reply-To: <5192A522.3040002@savoirfairelinux.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox