On Mon, Nov 01, 2010 at 08:18:24PM +0100, CÃdric Villemain wrote: > 2010/11/1 hubert depesz lubaczewski <depesz@xxxxxxxxxx>: > > On Mon, Nov 01, 2010 at 07:18:22PM +0100, Filip RembiaÅkowski wrote: > >> 2010/11/1 hubert depesz lubaczewski <depesz@xxxxxxxxxx>: > >> > >> > as I understand, max number of xlog files in pg_xlog should be ( 1 + 2 * > >> > checkpoint_segments ). > >> > >> why? > >> > >> for a server overloaded with R/W transactions, it's possible to go beyond this. > >> checkpoints just do not keep up. > >> right now I have an 8.3 with checkpoint_segments=3, constantly running > >> pgbench and I see 8 WAL segments. > > > > you will notice in the logs that the system doesn't look like very > > loaded. > > i mean - there is fair amount of work, but nothing even resembling > > "overloaded". > > There exists some checkpoint which occur more frequently than perhaps > expected. (less than 15 minutes)... > > The logline about checkpoint might be usefull. Still I wonder what > your question is exactly ? why the number of wal segments is larger than 2n + 1 Best regards, depesz -- Linkedin: http://www.linkedin.com/in/depesz / blog: http://www.depesz.com/ jid/gtalk: depesz@xxxxxxxxxx / aim:depeszhdl / skype:depesz_hdl / gg:6749007 -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
