On Nov 18, 2009, at 1:25 PM, presta wrote: > > Hello, > > I'm wondering if shared cache and read uncommited isolation level with > asyncronous I/O enabled is possible ?
I haven't tried, but I assume it is possible. The two features don't really interact. > In sqlite3async.c I see a shared mutex between read and write > operations, so > I doubt that it is possible to have real concurrency between read and > write... Each shared-cache has its own mutex. The mutex is held for the duration of each sqlite3_step() call. So the way you're defining it here, you can't have "real" concurrency when using shared-cache mode in any case. However, using asynchronous IO allows sqlite3_step() to return more quickly when writing to the database file (because it doesn't actually do IO, just adds writes to a write-queue that is serviced by a background thread. Dan. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
