Backing Up the Archived Logs and the Control File
After open or inconsistent closed backups, Oracle recommends backing up all archived logs produced during the backup, and then backing up the control file after the backup completes.
If you do not have all archived redo logs produced during the backup, then you cannot recover the backup because you do not have all the redo records necessary to make it consistent. Having a control file backup generated after the completion of the database backup is helpful when using RMAN because the control file contains a record of the backup.
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