b.bum wrote: > What changed in SQLite3 such that the stack size is significantly larger for > common operations? >
Version 3 supports databases with different page sizes. The routine in question (the "balance" routine in btree.c) has always needed stack space that is roughly 10x the size of one database page. In version 2, the database page size was fixed at compile-time to 1024 bytes. So the stack space needed was about 10K. Version 3 can read a database with any page size up to SQLITE_MAX_PAGE_SIZE, currently set to 8192, IIRC. So we need about 80K of space in the balancer. You can raise SQLITE_MAX_PAGE_SIZE as large as 65536 if you want, but then you really need a lot of stack...
The balance routine needs 10x the page size of space to do its job. That space needs to come from somewhere. I chose the stack since the stack is readily at hand. Other options include malloc(), with a performance penalty, or alloca(), which does not work right on many systems.
-- D. Richard Hipp -- [EMAIL PROTECTED] -- 704.948.4565
