ORA-38782：cannot flashback database to non-guaranteed restore point 'string'
错误码
错误描述：cannot flashback database to non-guaranteed restore point 'string'
错误原因：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.
解决方法：Consider picking a guaranteed restore point to flashback the database to, if there is one.
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