On Sat, Sep 5, 2015 at 12:00 PM, Hector Sánchez hec...@planatec.es [firebird-support] <firebird-support@yahoogroups.com> wrote:
> > > I discovered something else quite interesting: > > I realized both IB and FB dbs have pagebuffers set to 100.000. I changed > FB to 0 and now it works like I expected!!..Same query now completes on FB > on 50 sec. It seems this is the problem although I don't understand why. > > Nevertheless, I'll try on a physical machine as you and Carlos suggest and > see how it behaves. > > Very odd. Could you collect the performance stats for the query on the two systems? Specifically, I'd like to know how much physical I/O each did - that's reported as Reads and Writes. Fetches and Marks don't matter here. Cheers, Ann On another system I worked on we realized as the cache got very large that a totally fair LRU was taking up a significant fraction of the CPU load. That might be what you're seeing.
