>> Are we talking about deferred constraint evaluation by a chance? :)
>
> More or less - yes ;) But this is not "true" deferred constraint - in my case its
> deferred until end of statement, not end of transaction. It may be easyer to
> implement i think

Ok, you've convinced me here. :)

Now another question: where do we put the files to load? On the file
system accessible from the server? Should we support remote bulk load?

Roman