Re: BUFFERS setting

Mariusz Malogrosz wrote: > > Buffers are good, the number of mod bufs may not tell you everything. > It all depends on the ckpintvl and the lru settings , if the lru's are set > low they > will constatly clean your buffers so your mod # of bufs will be low . > More bufs = better cache. 40mb of bufs is not a lot. Depends on how many > users > and what they do. Is your appl doing a lot of insert/update/delete or is it > mainly reads. > > Mariusz Malogrosz > > Neil Truby <ntruby@netcomuk.co.uk> wrote in article > <32B85E13.1779@netcomuk.co.uk>... > > I'm running OnLine 7.13 on a Sun Sparcserver 20. It has 160M of physical > > memory. We have a bought-in application which is very resource hungry. > > At the suggestion of Tech Support I bumped BUFFERS up to 20K > > (40MBytes). However, onstat -b consistently shows only a few hundred of > > the 20,000 BUFFERS modified at any one time. Am I correct in inferring > > that I therefore have BUFFERS too high, and could begin to reduce it > > until I notice degradation in my read/write cache percentages (currently > > 93 and 87 respectively)? > > > > Thanks > > > > Neil Truby > > Chase Bank > > Bournemouth, UK > > My answer would by yes because I went thru the same thing. When I first installed on-line 7.10UC1 I gave it a lot of buffers and no matter how much I gave it it would not go over 90%. So I decreased them and I average about 95% now (my chkpoint interval, LRU settings were the defaults at that time).