The wal_buffers is 64Kb (The default)...What Does wal_buffers do? 2008/10/8 Julio Leyva <[EMAIL PROTECTED]>
> well it depends , our D.B is really high in transactions, and > checkpoints_segments along with the wal_buffers are ok. you need to play > with both of them > > > > > > > ------------------------------ > Date: Wed, 8 Oct 2008 14:19:37 -0200 > From: [EMAIL PROTECTED] > To: [EMAIL PROTECTED] > Subject: Re: [ADMIN] checkpoint_timeout > CC: [EMAIL PROTECTED]; [EMAIL PROTECTED]; > pgsql-admin@postgresql.org > > > Hello Julio, > If I set my postgresql server to checkpoint_segments = 10 aren't going to > be poor segments? > > > 2008/10/8 Julio Leyva <[EMAIL PROTECTED]> > > We have a transactional D.B writing directly to postgres (8.3) and these > parameters have worked ok for us > > > checkpoint_timeout = 5min > checkpoint_segments = 10 > wal_buffers = 1024kB > > > > ------------------------------ > Date: Wed, 8 Oct 2008 12:34:00 -0200 > From: [EMAIL PROTECTED] > To: [EMAIL PROTECTED] > Subject: Re: [ADMIN] checkpoint_timeout > CC: [EMAIL PROTECTED]; pgsql-admin@postgresql.org > > > Hello Brad, > > All of my bgwriter parameters is set on default. Following:#bgwriter_delay > = 200ms # 10-10000ms between rounds > #bgwriter_lru_percent = 1.0 # 0-100% of LRU buffers > scanned/round > #bgwriter_lru_maxpages = 5 # 0-1000 buffers max written/round > #bgwriter_all_percent = 0.333 # 0-100% of all buffers > scanned/round > #bgwriter_all_maxpages = 5 # 0-1000 buffers max written/round > > I am trying now to increase the checkpoint_segments to 40... > > 2008/10/8 Brad Nicholson <[EMAIL PROTECTED]> > > On Wed, 2008-10-08 at 10:31 -0200, Rafael Domiciano wrote: > > The server is running Postgres 8.2.4 > > When the server is doing too much operations like I, U or D the > > postgres stop a while each 5 min...! > > I mean "stopping" that I don't receive any response from postgres, and > > the process the all people are running stay there, waiting for > > something. > > I read a several names to it like: gap, stall, slowdown... I don't > > know the write expression for this situation. > > The bgwriter was added to help alleviate this problem. > > What are your settings for that? The solution may be to push dirty > buffers to disk more aggressively via the bgwriter so you have less work > to do at checkpoint time. > > > -- > Brad Nicholson 416-673-4106 > Database Administrator, Afilias Canada Corp. > > > >
