Re: Vacuum Problems (locking)

Mike Goldner <mgoldner@agmednet.com> writes:
> First of all, my max_fsm_pages is obviously way off.  However, every
> time I increase my max_fsm_pages the next vacuum says that it requires
> more.  Will there every be a plateau in the requested pages?

We realized recently that this can happen if you have a single relation
that all by itself needs more FSM space than you've got; any per-table
space beyond max_fsm_pages is disregarded in the calculation of the
total system-wide space needed, and so you get this inflationary effect
where the reported requirement keeps going up when you increase the
setting.  There's a fix in for 8.2.

> So, all indications point to postgres blocking all access during the
> entire vacuum.

You haven't said anything I consider credible evidence of that.  But try
looking in pg_locks next time.

            regards, tom lane