As part of the RMAN script during backup to disk for example you may have a statement to delete the obsolete backups. And in cases when backup piece is not found the RMAN fails with the error shown below when it can’t delete the obsolete backup.
Example (portion of the script to delete obsolete backup):
DELETE NOPROMPT OBSOLETE REDUNDANCY = 7;
Error message displayed when backup piece is not found.
RMAN-06207: WARNING: 2 objects could not be deleted for DISK channel(s) due
RMAN-06208: to mismatched status. Use CROSSCHECK command to fix status
This error can be fixed if the FORCE option is used when deleting obsolete backup, it will update the RMAN repository that the backup has been deleted regardless it was found or not.
DELETE FORCE NOPROMPT OBSOLETE REDUNDANCY = 7;