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How do you restore backup sets and controlfiles that were deleted out of the catalog?
We need to restore an archive log that was backed up 7 days ago but it has been deleted and no longer in the catalog but we restored the backup files from tape to a different drive.
Check oracle rman doc for catalog command
Use the CATALOG command to do the following:
Add backup pieces and image copies on disk to the RMAN repository.
Record a datafile copy as a level 0 incremental backup in the RMAN repository, which enables you to use it as part of an incremental backup strategy.
Record the existence of the last user-managed datafile copies made after the final shutdown in Oracle7, before migrating the database to Oracle8.