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 | 
Total number of archived redo log files backed up. | 
NUM_DISTINCT_FILES_BACKED | 
NUMBER | 
Number of distinct archived redo log files backed up. | 
MIN_FIRST_CHANGE# | 
NUMBER | 
Minimum value for the first SCN of any redo log file in this summary. | 
MAX_NEXT_CHANGE# | 
NUMBER | 
Maximum value for the NEXT_CHANGE# SCN of any redo log file in this summary. | 
MIN_FIRST_TIME | 
DATE | 
Minimum value for the time of the first change in any redo log. Along with MAX_NEXT_TIME, forms the redo range. | 
MAX_NEXT_TIME | 
DATE | 
Maximum value for the time of the next change after any redo logs in this session. | 
OUTPUT_BYTES | 
NUMBER | 
Sum of sizes of all output pieces generated by this job. | 
OUTPUT_BYTES_DISPLAY | 
VARCHAR2(4000) | 
Same value as OUTPUT_BYTES, but converted to a user-displayable format, for example, 798.01M or 5.25G. |