On Thu, 22 Dec 2005, Harry Jackson wrote: > I am currently using a dual Opteron (248) single core system (RAM > PC3200) and for a change I am finding that the bottleneck is not disk > I/O but CPU/RAM (not sure which). The reason for this is that the most > frequently accessed tables/indexes are all held in RAM and when > querying the database there is almost no disk activity which is great, > most of the time. > > At the moment everything is working OK but I am noticing an almost > linear increase in time to retrieve data from the database as the data > set increases in size. Clustering knocks the access times down by 25% Let's find out what's going on first. Can you find out the most expensive query. Also, according to you what you said: (1) execution time is linear to data set size (2) no disk IO - so why cluster will improve 25%? Regards, Qingqing
