exm\imp or rman?
Recently i got dump file of database structure. I imported successfully with imp utility. There are no data, only structure. And now our programmer will migrate data from our system to new Oracle database step by step - piece by piece. Maybe it will take 1 week(~10steps). Everyday new part will migrate to database. The task is - i must have copy of database after each step. If he will do some mistakes i have to restore database 1 step previous state.
I only can use exp and imp utilities yet. And learning rman but dont know enough. Is it possible to accomplish this tasks with these utilities-exp\imp? or i must use rman?