Purpose: To ensure that data about backups in the recovery catalog or control file is synchronized with actual files on disk or in the media management catalog.
If the backup is on disk, then the CROSSCHECK command checks whether the header of the file is valid.
If the backup is on tape, then the crosscheck command checks that the backups exist in the media management software's catalog.
Backup pieces and image copies can have the status AVAILABLE, EXPIRED, or UNAVAILABLE.
NOTE:
The CROSSCHECK command *does not* delete operating system files or remove repository records.
For such operations, you must use the DELETE command.
In short, in RMAN terms, obsolete means "file is not needed", whereas expired means it "file not found".
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