| From: | Michael Fuhr <mike(at)fuhr(dot)org> |
|---|---|
| To: | Dan Harris <fbsd(at)drivefaster(dot)net> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Table locking problems? |
| Date: | 2005-08-09 18:52:01 |
| Message-ID: | 20050809185201.GA25325@winnie.fuhr.org |
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| Lists: | pgsql-performance |
On Tue, Aug 09, 2005 at 12:04:11PM -0600, Dan Harris wrote:
> These changes have definitely improved performance, but I am now
> finding some trouble with UPDATE or DELETE queries "hanging" and
> never releasing their locks. As this happens, other statements queue
> up behind it.
Have you examined pg_locks to see if the UPDATE or DELETE is blocked
because of a lock another session holds?
Are you using foreign keys? When updating referencing rows, released
versions of PostgreSQL acquire a lock on the referenced row that can
hurt concurrency or cause deadlock (this will be improved in 8.1).
--
Michael Fuhr
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