ORA-38793: cannot FLASHBACK the database to a future SCN/time
Cause: The Flashback Database target SCN/timestamp is greater than the current database SCN/timestamp and the database incarnation is not the last opened incarnation.
Action: If the target SCN/timestamp is in the current incarnation or a child incarnation whose branch point is after the current database SCN then RECOVER DATABASE to the target SCN/time. If the target SCN/timestamp is in a child incarnation whose branch point is prior to the current database SCN then FLASHBACK DATABASE to before the branch point. Next use RMAN to reset the database to the child incarnation. Finally, RECOVER DATABASE to the target SCN/time.
ORA-38793错误是指无法将数据库闪回到未来的SCN（系统改变码）或时间。