OCP换题库了，最新052考试题库及答案整理-60

标签：inactive   disk   rate   about   gen   mem   考试题   table   eve   

60、Which two are true about UNDO data?

A. Inactive UNDO is never written to disk.

B. Active UNDO is always kept in memory

C. Only DML statements generate UNDO.

D. Active UNDO can never be overwritten.

E. It can be used to restore a table by using FLASHBACK TABLE.

F. Inactive UNDO cannot be overwritten until the elapsed time since becoming inactive exceeds UNDO RETENTION.

Correct Answer: DE

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OCP换题库了，最新052考试题库及答案整理-60

标签：inactive   disk   rate   about   gen   mem   考试题   table   eve   

原文地址：https://www.cnblogs.com/alice9313/p/9661358.html