Oracle : Ошибка ORA-19602

"cannot backup or copy active file in NOARCHIVELOG mode"
*Cause: You tried to copy or backup a file that was not closed cleanly,
and the database was in NOARCHIVELOG mode. This is not allowed
because when restored, the file will require redo application
before it is usable, and redo is not currently being saved
beyond the contents of the online redo logs.
*Action: Take the tablespace offline clean or close the database and retry
the copy or backup.

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