多选题
Which two are prerequisites for performing a flashback transaction?（）
发布日期：2022-06-29
A
Flashback Database must be enabled.
B
Undo retention guarantee for the database must be configured.
C
EXECUTE privilege on the DBMS_FLASHBACK package must be granted to the user flashing back transaction.
D
Supplemental logging must be enabled.
E
Recycle bin must be enabled for the database.
F
Block change tracking must be enabled tor the database.
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