On Thursday, January 27, 2011 02:23:48 PM Cédric Villemain wrote: > 2011/1/27 Andres Freund <andres@xxxxxxxxxxx>: > > On Thursday, January 27, 2011 12:24:10 PM Cédric Villemain wrote: > >> > maintenance_work_mem = 512MB > >> > >> 128MB is usualy enough > > > > Uhm, I don't want to be picky, but thats not really my experience. Sorts > > for index creation are highly dependent on a high m_w_m. Quite regularly > > I find the existing 1GB limit a probleme here... > > That is right for index creation, but not for 'pure' maintenance > stuff. Once the database is running as usual, there is no really point > to give auto-vacuum or auto-analyze much more (depend on the raid card > memory too ...) Even that I cannot agree with, sorry ;-). If you have a database with much churn a high m_w_m helps to avoid multiple scans during vacuum of the database because the amount of dead tuples doesn't fit m_w_m. Andres -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
