On Sat, Feb 4, 2012 at 8:27 AM, Gary Chambers <gwchamb@gwcmail.com> wrote:
> All,
>
> I have a recently-migrated Pg cluster running 8.4.7 on Red Hat Enterprise
> Linux Client release 5.7 (Tikanga) in a VMware VM that is logging the
> subject warning. The application code is considerably old (deployed back in
> the 7.4 days, I believe) and the message is preceded by a call to select
> user_write_unlock(), which is a simple wrapper query that calls
> pg_advisory_unlock(). What are the causes and possible problems and
> side-effects of receiving such a log warning? Thank you for any assistance
> you can provide.
That means that you didn't have the lock you were trying to release.
Whether that indicates a critical error or not depends on application
logic.
ChrisA