Oracle : Ошибка ORA-38771

"unnamed datafile(s) added to control file by flashback recovery"
*Cause: The recovery step of FLASHBACK DATABASE encountered the creation
of a datafile that could not be added to the control file.
An entry has been added to the control file for the new
datafile, but with the file name UNNAMEDnnnn, where nnnn
is the file number. Related error messages provide the file
names that were originally used to create the files.
*Action: Rename the file in the control file, or use the ALTER
ALTER DATABASE CREATE DATAFILE command to create a file
suitable for recovery. If the file is not going to be
recovered, then take it offline with the FOR DROP option.
The recovery step of Flashback can be resumed by entering
a RECOVERY command with the same SCN or timestamp as used
in the FLASHBACK DATABASE command. For example,

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