2018版OCP 11g 052最新考试题库整理（带答案）（29）

29、Which two are true about undo tablespaces?

A) They always retain undo for the time period defined by UNDO_RETENTION.

B) They must have only one data file.

C) They can be recovered only when an Instance Is In MOUNT state.

D) Tables can be created In undo tablespaces by SYS.

E) Single-Instance databases can have only one active undo tablespace.

Answer:CE

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