> > 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
