On Mon, Nov 01, 2010 at 08:13:49PM +0100, CÃdric Villemain wrote: > 2010/11/1 hubert depesz lubaczewski <depesz@xxxxxxxxxx>: > > On Mon, Nov 01, 2010 at 07:22:50PM +0100, CÃdric Villemain wrote: > >> > as I understand, max number of xlog files in pg_xlog should be ( 1 + 2 * > >> > checkpoint_segments ). > >> (2 + checkpoint_completion_target) * checkpoint_segments + 1 > >> => 291 > > > > this is formula gave to me by rhodiumtoad on irc, but we tested with lower > > checkpoint_completion_target and it didn't change *anything*. > > You'll have between 211 and 291 files for 0.1 to 0.9 > checkpoint_completion_target. > You'd have more than the number of files given by formula used during > your tests ? yes. we decreased checkpoint_completion_target to 0.5, and the numbers of xlog segments *did not change*. also - can you explain why "fraction of total time" (time!) would directly relate to number of xlog files existing in pg_xlog? I mean - you're not the first person to suggest it, but I don't see any way that these two could be related. 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
