I found the quickest way to refresh a database is to copy all files (datafiles, control files, redo log files) via the operating system (UNIX in my case) and then startup the copied database via Oracle. If you need more details, I can provide you with necessary script files.
Sitansu S. Mittra
Could you please send me the scripts at email@example.com?
It would be useful
Thanks in adavnce