1Z0-053 争议题目解析86

1Z0-053 争议题目解析86

考试科目:1Z0-053
题库版本:V13.02

题库中原题为:

86.Your production database is running in archivelog mode and you are using recovery manager (RMAN)
with recovery catalog to perform the database backup at regular intervals. When you attempt to restart the
database instance after a regular maintenance task on Sunday, the database fails to open displaying the
message that the data file belonging to the users tablespace are corrupted.
The steps to recover the damaged data files are follows:

  1. Mount the database
  2. Open the database
  3. Recover the data file
  4. Restore the data file
  5. Make the data file offline
  6. Make the data file online
    Which option identifies the correct sequence that you must use to recover the data files?
    A. 2, 4, 3
    B. 1, 4, 3, 2
    C. 2, 5, 4, 3, 6
    D. 5, 2, 4, 3, 6
    E. 1, 5, 4, 3, 6, 2
    Answer: E

争议点:
实际上我们实验可以发现,对于“试图重启数据库,发现在数据库打开的时候收到一个消息,属于users的表空间的数据库文件损坏。” 这时数据库并不会crash,就是在mount状态的,所以实际1步骤不需要。
然后按照C选项的5,2,4,3,6的步骤就可以实现恢复。
而且先离线此文件打开数据库,可以使得业务受到的影响最小化(因为可以先打开数据库,其他未受损文件可以正常使用)。

初步结论:
个人认为D选项更为合适。

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