Ian Westmacott wrote:
> On Tue, 2008-04-29 at 17:12 -0400, Alvaro Herrera wrote:
> > Can you verify whether age(pg_database.datfrozenxid) is shrinking after
> > vacuuming? If the age() of a database is higher than the applicable
> > max_freeze_age, then it will always be chosen.
>
> One of the databases is about 1.5TB, so that could take a while.
> Anything else I could look at in the meantime? The age of these
> databases right now is about 290039577. Also, autovacuum doesn't always
> choose the same DB, it alternates between template1 and one of mine --
> going back through a couple of months of logs I don't see it ever
> choosing the same one twice in a row.
Right -- if you have two databases over the wraparound edge, it will
alternate between them.
I still think that the autovac is dying before completing the task. Did
you investigate whether there are "ERROR" messages coming from
autovacuum? No PG crashes would happen.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support