You can
perform limited recovery of a NOARCHIVELOG mode database by using incremental
backups. The incremental backups must be consistent backups.
If you have
taken incremental backups, RMAN will use your level 0 and level 1 backups to
restore and recover the database.
You must
specify the NOREDO option on the RECOVER DATABASE command if the online redo
log files are lost or if the redo cannot be applied to the incremental backups.
If you do not specify the NOREDO option, RMAN searches for the online redo log
files after applying the incremental backups. If the online redo log files are
not available, RMAN issues an error message.
Note: If the current online redo log
files contain all changes since the last incremental backup, you can issue the
RECOVER DATABASE command without the NOREDO option and the changes will be
applied.
