V$BACKUP_PIECE

Columns
   ___________________________
 
   MEDIA_POOL
   DELETED
   ELAPSED_SECONDS
   COMPLETION_TIME
   START_TIME
   STATUS
   TAG
   COPY#
   CONCUR
   MEDIA
   COMMENTS
   DEVICE_TYPE
   PIECE#
   SET_COUNT
   SET_STAMP
   STAMP
   RECID
   HANDLE

Related Views:

V$ARCHIVE 
V$ARCHIVED_LOG 
V$ARCHIVE_DEST 
V$ARCHIVE_PROCESSES 
V$BACKUP 
V$BACKUP_ASYNC_IO 
V$BACKUP_CORRUPTION 
V$BACKUP_DATAFILE 
V$BACKUP_DEVICE 
V$BACKUP_REDOLOG 
V$BACKUP_SET 
V$DELETED_OBJECT 
V$RECOVERY_FILE_STATUS 
V$RECOVERY_LOG 
V$RECOVERY_PROGRESS 
V$RECOVERY_STATUS 
V$RECOVER_FILE