An Oracle RMAN retention policy can be configured for each database. When RMAN retention rules are in effect, RMAN considers the backup jobs comprising data files and control files as obsolete, that is, no longer needed for recovery, according to criteria that you specify in the CONFIGURE RETENTION POLICY command. When you run DELETE OBSOLETE or CROSS CHECK operations, RMAN ages data by freeing disk and tape space used by backups that are no longer needed.
Do not configure RMAN retention policy if you want to retain data using the data aging feature provided in the CommCell console. To disable the RMAN retention policy, use the following command: CONFIGURE RETENTION POLICY TO NONE. This ensures that data will only be aged according to the retention rules specified in the associated storage policy copy.