"cannot add data file '%s' - file already part of database"
*Cause: The recovery step of FLASHBACK database encountered the
creation of a datafile and could not create the file
because the file name is already in use in the database.
The control file file entry for the file is 'UNNAMEDnnnnn'.
*Action: Use the ALTER DATABASE CREATE DATAFILE statement to create
the file with a different name.