Oracle OCP 082知识
剩余时间：
第 55 题 (多选题)：
Which three statements are true about UNDO and REDO.
A. UNDO is used for some flashback operations.
B. Both REDO and UNDO can be multiplexed.
C. UNDO is used for read consistency.
D. REDO is used for ROLLBACK.
E. REDO is used for read consistency.
F. REDO is used for instance recovery.
显示答案
正确答案：
A,C,F
解析：
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