Hello, Thanks Jim, i change stats_command_string=false and i wait but it's works now :-) Jérôme. Le jeudi 22 juin 2006 à 21:00 -0500, Jim Nasby a écrit : > On Jun 22, 2006, at 2:24 AM, Jérôme BENOIS wrote: > > We use 7.4.6 version and now we have a bad performance on our > > You should upgrade to the latest 7.4 version. > > > production server. We detected several strange messages in a log > > file : > > > > LOG: statistics buffer is full > > LOG: statistics buffer is full > > LOG: statistics buffer is full > > > > When i search on mailings list archive, i found a patch to increase > > the > > buffer size in src/include/pgstat.h > > > > -#define PGSTAT_RECVBUFFERSZ ((int) (1024 * sizeof(PgStat_Msg))) > > +#define PGSTAT_RECVBUFFERSZ ((int) (16384 * sizeof(PgStat_Msg))) > > > > And when i look the same file on the subversion trunk, the > > "PGSTAT_RECVBUFFERSZ" constant is defined in a new file : > > src/backend/postmaster/pgstat.c but with a same value. > > > > Can you explain this statistics buffer problem ? And increase this > > buffer size is a good resolution ? > > Do you have stats_command_string=on? If so, your best bet is probably > to disable that, because it has a very high overhead (I've seen as > much as over 50%). FWIW, Tom recently made changes in HEAD that > essentially remove the overhead for using stats_command_string. > -- > Jim C. Nasby, Sr. Engineering Consultant jnasby@xxxxxxxxxxxxx > Pervasive Software http://pervasive.com work: 512-231-6117 > vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461 > > >
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