Answer / guest

Cause: When opening the file to be placed in a copy or
backup set, to be inspected, or used as the target for an
incremental restore, the header was not recognized as a
valid file header for a file of the indicated type (data
file, archived log, or control file), belonging to the
current database.

Action: Ensure that the correct files are being specified
for the copy or backup operation.

Please add more information about this Error

ORA-01100: database already mounted

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RMAN-08107: channel string: block restore complete

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RMAN-10018: error cleaning up channel context

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QSM-01003: no query rewrite on DDL queries

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