Oracle Database Discussions

Hi,

I'm one doubt about drop user cascade..

Well, I need clear all scheme from database to do one import (from file dump).

i'm making one script to do this... and my doubt is:


if I to catch all user's from dba_user's in one cursor.. and execute drop user cascade to each user returned...

Do user system will be droped ?
I'll get some trouble if I to drop all ?

Sorry if I wrote something hard to understand.
Yours
Fernando.