On 2013-05-09 12:09:04 -0400, Robert Haas wrote: > On Mon, Mar 25, 2013 at 4:31 PM, Josh Berkus <josh@xxxxxxxxxxxx> wrote: > > In the past, setting vacuum_freeze_min_age (vfma) really low (say to > > 10000 or 50000) would have caused lots of extra writing work due to > > dirtying extra pages for freezing. This has been our stated reason to > > keep vfma high, despite the obvious advantage of freezing tuples while > > they're still in the cache. > > That, and Tom's concern about forensics, which I understand to be the > larger sticking point. FWIW I found having sensible xmin/xmax repeatedly really useful for debugging problems. Most problems don't get noticed within minutes so loosing evidence that fast is bad. Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
