On 14 Jul 2012, at 3:07am, Udi Karni <uka...@gmail.com> wrote: > Thanks. I understand. I tried to set PRAGMA CACHE_SIZE=0; in the hope of > not cache anything and forcing Sqlite to always go to disk - but that > didn't help. > > I see some reads on pagefile.sys - but both the DB and the pagefile are on > SSD - so you would think it shouldn't be too costly to read one or both - > even in a more random fashion. > > The SSD disk read queue is just over 1 - so it doesn't quite fit the > typical scenario of IO bottlenecks - a high read queue and a disk arm > moving frantically.
I don't think you can alter this inside SQLite. The caching you have noticed is not being done by SQLite. It's either a part of Windows' read-ahead caching, or something being done by your storage driver. Windows gets a lot of its speed by doing things like read-head caching. It can lead to strange results like the ones you reported. Simon. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
