1Z0-053 争议题目解析706

考试科目：1Z0-053
题库版本：V13.02

题库中原题为：

706.You execute the following command to set the redundancy retention policy in Recovery Manager
(RMAN):
RMAN>CONFIGURE RETENTION POLICY TO REDUNDANCY 3;
Identify the statement that correctly describes the implications of this command.
A, when there are already three backups, for the fourth backup RMAN removes the oldest backup.
B. When there are already three backups, for the fourth backup RMAN marks the oldest backup as
obsolete.
C. the number of backups that are retained is equal to three and it includes full, incremental, and
cumulative backups.
D. when there are already three backup, one of the existing backups must be removed manually before
taking the fourth backup.
Answer:A

争议点：
网上有人说选择B，比如“标记为正确答案，不看answer版”题库。

比如：
Riveore的解析：http://blog.csdn.net/rlhua/article/details/14228269
LuiseDalian的解析：http://blog.itpub.net/17013648/viewspace-1349676/

本题考查 retention policy以及 obsolete意义。

初步结论：
选择B。