Hello all, 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 On Jul 22, 2011, at 10:40 AM, Simon Slavin wrote: > > On 22 Jul 2011, at 2:11pm, Григорий Григоренко wrote: > >> Let's say it'll shrink by 50%. Still, if first-time runnning query timing >> will change from 2 min to 1 min it is still not acceptable. >> I cannot wait even a minute without logging. >> >> So, before restructuring database and re-writing code I just want to >> understand SQLITE behaviour. >> The question is: does SQLITE need to load whole index to start using it? Or >> SQLITE can use partial loads to quickly find records it needs (defined by >> columns in conditions)? > > SQLite loads only the pages it needs. It doesn't load a whole index into > memory unless the entire index fits in one page (only a few rows). If your > search still runs too slowly your problem is more likely to be that you are > searching on text fields rather than integer fields. > > Searching on integers is /must/ faster than searching on test fields. If you > store the id code of the computer in your log file rather than the text name > of the computer, a search for log entries for a particular computer will be > faster. I don't know what you're doing with your 'kind' column, but again if > you assign integer values to your different values for 'kind' and store those > instead, your search will be faster. > > Simon. > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
