Re: ANALYZE locks pg_listener in EXCLUSIVE for long time?

Philip Warner <pjw(at)rhyme(dot)com(dot)au> writes:
> If possible, this seems like a great option. We currently have a large
> database with several hundred users who get locked out for as much as half
> an hour while ANALYZE runs.

If it takes half an hour to ANALYZE pg_listener, I think that ANALYZE is
not your real problem :-(. You need a much more aggressive vacuuming
policy on that table. Maybe a cron job issuing "vacuum pg_listener"
once a minute would do? And get the size of the table knocked down to
something less stratospheric to begin with --- perhaps stop all the
listeners while you TRUNCATE the table.

The existing listen/notify infrastructure isn't really designed for
notification rates exceeding a few events per minute ...

regards, tom lane