Using RMAN, how do you restore from an old backup file?

HI,
I use Oracle 9i on Solaris.
I'm currently doing incremental level 0 hot backups every night using RMAN in NOCATALOG mode. The controlfile is backed up with the database. I back it up to a file (e.g. "level0_20041225.dmp"). After I back it up, it's backed up to tape using Veritas. Before doing a backup, I delete the old one first.
I need to restore a copy of the database backup that was taken a month ago. This file is on tape. How do I go about it using RMAN? The documentation is not too clear as it talks more about Restoring the control file and the latest copy of the database.
How do you restore an old copy of the database from a database file?
Pls advise
Thanks

You can recover to the last committed transaction,
provided you have the current controlfile, archived
logs since the backup and the current online logs.
Here's the procedure in a nutshell:
a) Restore datafiles from tape.
b) Recover database using restored files + current
controlfiles and archived/online logs. RMAN will prompt
you for the logs it needs for recovery.
You can also perform this type of recovery using a
backup controlfile. In this case you would still need
all logs as above. After recovery, you would have to
open the database with RESETLOGS because you are using
a backup controlfile.
If you don't want/need to recover up to the last
committed transaction, you use a backup controlfile and
perform incomplete recovery (time or change based). This
simply means that you stop the application of redo at
the time or SCN of your choice.
Most of the scenarios of interest are documented in
the following book:
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96566/toc.htm
Hope this helps.
Kailash.

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