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 join with almost any other catalog view. | 
SESSION_KEY | 
NUMBER | 
Session identifier. Use in joins with RC_RMAN_OUTPUT and RC_RMAN_BACKUP_JOB_DETAILS. | 
RSR_KEY | 
NUMBER | 
Unique key for the row in RC_RMAN_STATUS corresponding to the job that created this file. | 
BTYPE | 
CHAR(9) | 
The backup type container, which can be BACKUPSET, IMAGECOPY, or PROXYCOPY. | 
BTYPE_KEY | 
NUMBER | 
Unique identifier for the backup type. It is BS_KEY/COPY_KEY. | 
ID1 | 
NUMBER | 
For backups taken as backup sets, this column contains SET_STAMP. For proxy copy or image copy backups, this column contains the RECID from the control file. | 
ID2 | 
NUMBER | 
For backups taken as backup sets, ID2 contains SET_COUNT. For image copy and proxy copy backups ID2 contains STAMP. | 
FILETYPE | 
VARCHAR2(15) | 
The type of this backup file. Possible values are BACKUPPIECE, COPY, or PROXYCOPY. | 
FILETYPE_KEY | 
NUMBER | 
Backup piece key if the file is a backup piece, other wise COPY_KEY. You can use this key to change the status of the file to available. | 
STATUS | 
VARCHAR2(1) | 
Can be either U (for unavailable backups) or X (for expired backups). | 
FILESIZE | 
NUMBER | 
Size in bytes of the unusable backup file. | 
DEVICE_TYPE | 
VARCHAR2(255) | 
Device type storing this unusable backup file. Possible values are DISK and SBT_TAPE. | 
FILENAME | 
VARCHAR2(1024) | 
File name. | 
MEDIA | 
VARCHAR2(80) | 
A comment that contains further information about the media manager that created this backup. | 
MEDIA_POOL | 
NUMBER | 
The number of the media pool in which the backup is stored. |