On 2013-04-12 16:58:44 +0530, Pavan Deolasee wrote: > On Fri, Apr 12, 2013 at 4:29 PM, Andres Freund <and...@2ndquadrant.com>wrote: > > > > > > > I don't think that holds true at all. If you look at pg_stat_bgwriter in > > any remotely bugs cluster with a hot data set over shared_buffers you'll > > notice that a large percentage of writes will have been done by backends > > themselves. > > > > Even if what you are saying it true, which I am sure is, the pages that the > backend is evicting mustn't be recently used by the LRU algorithm which > means that the WAL pertaining to the last change to the page in most > likelihood is already replicated, unless the replication is really lagging > much behind. Of course, if the standby is not able to keep pace with the > master in a realistic manner then we have a problem with the approach.
It frequently takes time in the sub to few second range for usagecounts in zero. 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
