Tom Lane wrote:
> Philip Warner <pjw@rhyme.com.au> writes:
> > Does this mean that ANALYZE will take an exclusive lock on pg_listener
> > until the ANALYZE finishes? Or is there some other cause?
>
> ANALYZE does not take an exclusive lock on anything. However, the
> async.c functions want AccessExclusiveLock on pg_listener, so they
> quite possibly would get blocked by ANALYZE's not-so-exclusive lock.
>
> Possibly we could reduce the strength of the lock taken by the async.c
> functions ... I haven't thought hard about it. The long-term answer is
> certainly a wholesale rewrite of the listen/notify mechanism.
Gavin was working on it a while ago but I am not sure how far he got.
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
359-1001+ If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square,
Pennsylvania19073