On 2015-04-16 10:20:20 -0300, Alvaro Herrera wrote: > I think you're failing to consider that in the patch there is a > distinction between read-only page accesses and page updates. During a > page update, HOT cleanup is always done even with the patch, so there > won't be any additional bloat that would not be there without the > patch.
That's not really true (and my benchmark upthread proves it). The fact that hot pruning only happens when we can get a cleanup lock means that we can end up with more pages that are full, if we prune on select less often. Especially if SELECTs are more frequent than write accesses - pretty darn common - the likelihood of SELECTs getting the lock is correspondingly higher. 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
