On 2013-05-30 12:11:23 -0700, Josh Berkus wrote: > > > 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.
If we have reason to vacuum the relation we do it at vacuum_freeze_table_age, not only at autovacuum_max_freeze_age. The difference is that the latter triggers a vacuum, while the former only changes a partial vacuum into a full one. Calling that behaviour unconditionally worse is, err, interesting... Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
