ORA-01244: unnamed datafile(s) added to control file by media recovery

admin

ORA-01244: unnamed datafile(s) added to control file by media recovery
Cause: 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: Rename the files to valid file names and resume recovery. If necessary the
command ALTER DATABASE CREATE DATAFILE 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.