RMAN-06478: WARNING: datafile copy string cannot be found on disk

RMAN-06478: WARNING: datafile copy string cannot be found on disk

Cause: The CHANGE DATAFILECOPY AVAILABLE command was used, but the datafile copy cannot be found on disk.

Action: If the storage containing the datafile copy has been removed from the host, restore it and retry the command. If the datafile copy is permanently gone, then issue the CHANGE DATAFILECOPY DELETE command for this datafile.

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