>-----Original Message----- >From: machiel.richards [mailto:machiel.richa...@gmail.com] >Sent: Tuesday, December 01, 2009 6:17 AM >To: 'Claudio Nanni' >Cc: mysql@lists.mysql.com >Subject: RE: Innodb buffer pool size filling up > >The size was at 2Gb and was recently changed to 3Gb in size during the last >week of November (around the 23rd / 24th) and as of this morning was already >sitting at 2.3gb used. > > [JS] At the others have said, the whole purpose of a buffer pool is to hold as much frequently used data as possible. That lowers the probability of having to do physical I/O, which is much slower than memory access. The buffer pool should be full. > >The total database size is about 750Mb. > > [JS] It does surprise me that the buffer pool fills up, even though it is three times the size of your database. My guess is that whatever mechanism is used to "scavenge" space in the buffer pool isn't triggered until the buffer pool is full; but that is simply a guess, I really have no idea.
Regards, Jerry Schwartz The Infoshop by Global Information Incorporated 195 Farmington Ave. Farmington, CT 06032 860.674.8796 / FAX: 860.674.8341 www.the-infoshop.com > >Regards > >Machiel > > > > > >From: Claudio Nanni [mailto:claudio.na...@gmail.com] >Sent: 01 December 2009 01:12 PM >To: machiel.richards >Cc: mysql@lists.mysql.com >Subject: Re: Innodb buffer pool size filling up > > > >That is basically its use, >the buffer pool is the collection of all mysql innodb buffers, >and after warm up it goes to keep all cacheable data. >How big is your INNODB_BUFFER_POOL_SIZE ? > >Cheers > >Claudio > > > >2009/12/1 machiel.richards <machiel.richa...@gmail.com> > >There are no errors in the logs at all. > > We have a script to calculate the percentages used and free in order >to do daily,weekly and monthly reporting trend analyses and thus we notice >the growth but no errors. > > > > >-----Original Message----- >From: Neil Aggarwal [mailto:n...@jammconsulting.com] >Sent: 01 December 2009 08:55 AM >To: mysql@lists.mysql.com >Subject: RE: Innodb buffer pool size filling up > >Machiel: > >> We have a MySQL database where the >> INNODB_BUFFER_POOL_SIZE >> keeps on filling up. > >Are you getting any errors or just noticing the buffer >pool is full? > >I saw some error messages about the buffer pool size >becoming a problem if the fscync is slow. Do you see >any more info in the logs? > > Neil > >-- >Neil Aggarwal, (281)846-8957, http://UnmeteredVPS.net >Host your MySQL database on a CentOS VPS for $25/mo >Unmetered bandwidth = no overage charges, 7 day free trial > > >-- >MySQL General Mailing List >For list archives: http://lists.mysql.com/mysql >To unsubscribe: > >http://lists.mysql.com/mysql?unsub=machiel.richa...@gmail.com > > > >-- >MySQL General Mailing List >For list archives: http://lists.mysql.com/mysql >To unsubscribe: >http://lists.mysql.com/mysql?unsub=claudio.na...@gmail.com > > > > >-- >Claudio -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
