1.One of your databases has archive logging enabled and RMAN backups are taken at regular intervals.

  The data file for the users tablespace is corrupt.

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  Which command must you execute before starting the recovery of this tablespace ?

  A) SWITCH DATAFILE ALL;

  B) ALTER TABLESPACE users OFFLINE TEMPORARY;

  C) STARTUP FORCE

  D) ALTER TABLESPACE users OFFLINE IMMEDIATE;

  E) ALTER TABLESPACE users OFFLINE NORMAL;

  Answer:D

  (解析:由于数据文件损坏,所以表空间无法正常 offline,会报错,只能用 immediate 选项。

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