Back up to tape
When you back up to tape, you must ensure that an operator is available and that you have sufficient media.
Keep an operator available during a backup to mount tapes as prompted. A backup could take several reels of tape. When an operator is not available to mount a new tape when one becomes full, the backup waits. During this wait, when the backup is an online backup, the physical log space could fill up, and that causes the database server to stop the backup. Thus, make sure that an operator is available.
After a tape fills, the ontape utility rewinds the tape, displays the tape number for labeling, and prompts the operator to mount the next tape when you need another one. Follow the prompts for labeling and mounting new tapes. A message informs you when the backup is complete.