Youexecutedthefollowingqueryinyourdatabase:SELECToldest_flashback_scn,oldest_fla
2021-05-05
A.Thetimewhenthelastflashbackoperationinyourdatabasewasperformed.
B.Thetimewhenthefirstflashbackoperationinyourdatabasewasperformed.
C.AlistofflashbackoperationsperformedinyourdatabaseusingSCNandtime.
D.Theapproximatetimeandthelowestsystemchangenumber（SCN）towhichyoucanflashbackyourdatabase.
正确答案：参考D
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