Hi, It has worked fairly well with small databases, but I see the problem with medium to large files. Have you tried to run ANALYZE on your database? I'm curious to know how long it takes.
-- Tito On Jul 24, 2011, at 8:26 AM, Григорий Григоренко wrote: >> >> Perhaps my post dated Aug. 19, 2009 will help a little bit: >> >> http://www.cocoabuilder.com/archive/cocoa/242954-core-data-dog-slow-when-using-first-time-after-boot.html >> >> -- Tito >> > > Thanks for sharing. "warming file" is a way to cache whole database as I > understand it. > > After everything is cached scattered reading from database runs faster. > > Unfortunately, in my case base size is ~ 3.5 Gb; it's too big for this > strategy. > > Even if I read at 25 Mb/s rate it will took 3500 / 25 = ~140 seconds just to > read whole db file. > > And what's more important I've only 2 Gb of RAM. > > Anyway, thanks for sharing. I guess these cases are similar. > > > To me problem looks like this: > > SQLITE needs to read (cache) from db a lot (too much?) while first-time > query execution even if a query uses nicely matched index and returns nothing. > > And SQLITE is doing lot's of scattered readings during query execution; not > trying to somehow batch read or similar. That's why file caching helps. > > If it's true not sure there's a simple and nice solution. > > I'll try some ideas (including normalization) and report results in this > topic next week. > _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
