V$BACKUP_DEVICE displays information about supported backup devices. If a device type does not support named devices, then one row with the device type and a null device name is returned for that device type. If a device type supports named devices then one row is returned for each available device of that type. The special device type DISK is not returned by this view because it is always available.

Column Datatype Description
DEVICE_TYPE VARCHAR2(17) Type of the backup device
DEVICE_NAME VARCHAR2(513) Name of the backup device