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* "slow lock" log in addition to log_min_duration_statement ?
@ 2010-11-10 20:28 Bryce Nesbitt <bryce2@obviously.com>
0 siblings, 1 reply; 2+ messages in thread
From: Bryce Nesbitt @ 2010-11-10 20:28 UTC (permalink / raw)
To: pgsql-sql
I have a cluster with log_min_duration_statement set to log slow
queries. Presently what I'm tracking down is almost certainly a lock
problem. Is there any analog of log_min_duration_statement for locks?
If there is a lock on a certain critical tables for more than a few
hundredths of a second I want to know.
Similarly in pg_stat_activity, is there a way to get the parameters to
the current_query? I see the placeholders (e.g. $1, $2) but not the data.
This is with PostgreSQL 8.3.4
Thanks!
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: "slow lock" log in addition to log_min_duration_statement ?
@ 2010-11-12 15:50 Joshua Tolley <eggyknap@gmail.com>
parent: Bryce Nesbitt <bryce2@obviously.com>
0 siblings, 0 replies; 2+ messages in thread
From: Joshua Tolley @ 2010-11-12 15:50 UTC (permalink / raw)
To: Bryce Nesbitt <bryce2@obviously.com>; +Cc: pgsql-sql
On Wed, Nov 10, 2010 at 12:28:46PM -0800, Bryce Nesbitt wrote:
> I have a cluster with log_min_duration_statement set to log slow
> queries. Presently what I'm tracking down is almost certainly a lock
> problem. Is there any analog of log_min_duration_statement for locks?
> If there is a lock on a certain critical tables for more than a few
> hundredths of a second I want to know.
You could try log_lock_waits:
http://www.postgresql.org/docs/8.3/interactive/runtime-config-logging.html#GUC-LOG-LOCK-WAITS
It's defined in terms of deadlock_timeout, and reducing that to "a few
hundredths of a second" like you're interested in might cause all kinds of
load from the deadlock detector.
--
Joshua Tolley / eggyknap
End Point Corporation
http://www.endpoint.com
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2010-11-10 20:28 "slow lock" log in addition to log_min_duration_statement ? Bryce Nesbitt <bryce2@obviously.com>
2010-11-12 15:50 ` Joshua Tolley <eggyknap@gmail.com>
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