ORA-00299: must use file-level media recovery on data file string
What triggered the Error:
The control file does not contain an entry for this file, so block media recovery cannot be done.What should we do to fix it:
Restore the data file and perform file-level media recovery.
If this was not sufficient go over to:
Oracle Official Support Knowledge Center
Or maybe those geeks at: StackOverflow Board
Or maybe those geeks at: StackOverflow Board