| DB_NAME | VARCHAR2(8) | The DB_NAMEof the database incarnation to which this record belongs. | 
| DB_KEY | NUMBER | The primary key for this database in the recovery catalog. Use this column to form a join with almost any other catalog view. | 
| NUM_FILES_BACKED | NUMBER | Number of files backed up. | 
| NUM_DISTINCT_FILES_BACKED | NUMBER | Number of distinct files backed up (based on differing modification timestamps). | 
| MIN_MODIFICATION_TIME | DATE | Earliest modification time of any SPFILE backed up for this database. | 
| MAX_MODIFICATION_TIME | DATE | Latest modification time of any SPFILE backed up for this database. | 
| INPUT_BYTES | NUMBER | Total number of bytes in the input files backed up. | 
| INPUT_BYTES_DISPLAY | VARCHAR2(4000) | Same value as INPUT_BYTES, but converted to a user-displayable format, for example nM, nG, nT, nP. |