Right. I don't know this code or DBI but many frameworks create a pool of ids using sequence generators so that they can minimize round trips and know the id of new records before the are written.
> Robert DiFalco wrote >> Two common cases I can think of: >> >> 1. The PERL framework is only caching the insert and does not actually >> perform it until commit is issued. > > Wouldn't the same mechanism cache the corresponding SELECT?
Not likely, or if it did it wouldn’t be able to know what id was returned from the function (which calls nextval(), but that isn’t relevant here since it’s marked volatile). That makes it a possible scenario for what’s being witnessed here. Alban Hertroys -- If you can't see the forest for the trees, cut the trees and you'll find there is no forest.
