> Inhowfar did 8.4 make freezing worse? I can't remember any new problems
> there?
Before the Visibility Map, we always vacuumed all pages in a relation
when it was vacuumed at all. This means that we froze tuples at
vacuum_min_freeze_age, not at autovacuum_max_freeze_age, which is when
we do it post-8.4.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com