Oracle : Ошибка ORA-38782

"cannot flashback database to non-guaranteed restore point '%s'"
*Cause: An attempt was made to flashback database to a non-guaranteed
restore point while flashback database is off. You can only
flashback a database to guaranteed restore point when flashback
database is not on.
*Action: Consider picking a guaranteed restore point to flashback the
database to, if there is one.

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