There are two steps to getting your database open, restoring the missing datafiles and applying recovery. The first place to start is the Oracle documentation on how to use RMAN to perform these operations.
If you have preconfigured your RMAN channels, you can have RMAN open your database quite easily by performing the following in RMAN:
RESTORE DATABASE; RECOVER DATABASE;If you feel you need to put the database in a specific mode (MOUNT, NOMOUNT, OPEN), you can still perform these operations in SQL*Plus, or you can have RMAN issue the commands for you similar to the following:
STARTUP NOMOUNT; ALTER DATABASE OPEN;The commands to start up the database in MOUNT mode and open the database are the same in RMAN as in SQL*Plus.
This was first published in February 2006