Which are the prerequisites for performing flashback transactions on your database？（）
- A、 Undo retention guarantee for the database must be configured.
- B、 Supplemental log must be enabled for the primary key.
- C、 Supplemental log must be enabled.
- D、 Execute permission on the DBMS_FLASHBACK package must be granted to the user.
正确答案:B,C,D
答案解析:有
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