DB_NAME | 
VARCHAR2(8) | 
The DB_NAME of 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. |