The following is the ORA-16007 error message, you can learn the cause and solution of the Oracle database error.
ORA-16007 invalid backup control file checkpoint
Cause: The backup control file being opened for read-only access does not contain a valid control file checkpoint. Therefore the database cannot be opened for read-only access.
Solution: First open the database for read-write access which will result in a valid control file checkpoint. Then re-open the database for read-only access.
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