Oracle : Ошибка ORA-19603

"cannot backup or copy active file with KEEP .. UNRECOVERABLE option"
*Cause: The user tried to copy or backup a file that was not closed cleanly,
with KEEP .. UNRECOVERABLE option. This is not allowed
because when restored, the file will require redo application
before it is usable, and redo will not be saved because of
*Action: Take the tablespace offline cleanly, or close the database and retry
the copy or backup.

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