Oracle DB Error ORA-01244 unnamed datafile(s) added to controlfile by media recovery

The following is the cause of this error:

Media recovery with a backup control file or a control file that was rebuilt, encountered the creation of a datafile that was not in the control file. An entry has been added to the control file for the new datafiles, but with the file name UNNAMEDnnnn, where nnnn is the file number. Attached errors describe the file names that were originally used to create the files.

Action you can take to resolve this issue: Rename the files to valid file names and resume recovery. If necessary the ALTER DATABASE CREATE DATAFILE statement may be used to create a file suitable for recovery and do the rename. If the file is not going to be recovered then take it offline with the FOR DROP option.

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