Anne Rosset wrote: > Thanks Steve. > I found this: http://www.postgresql.org/docs/current/static/release-9-2-3.html > " > Fix performance problems with autovacuum truncation in busy workloads (Jan > Wieck) > Truncation of empty pages at the end of a table requires exclusive lock, but > autovacuum was coded to fail (and release the table lock) when there are > conflicting lock requests. Under load, it is easily possible that truncation > would never occur, resulting in table bloat. Fix by performing a partial > truncation, releasing the lock, then attempting to re-acquire the lock and > continue. This fix also greatly reduces the average time before autovacuum > releases the lock after a conflicting request arrives." > > So that is not the fix? > > (Sorry to ask a second time but I really need to make sure).
That's the commit that created the bug, AFAIU. It's a fix for a serious problem, but we overlooked that it introduced some other problems which is what you're now seeing. -- Álvaro Herrera http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers