1Z0-053 争议题目解析688

1Z0-053 争议题目解析688

考试科目：1Z0-053
题库版本：V13.02

题库中原题为：

688.Which two statements are true about the compressed backups in RMAN? (Choose two.)
A.Compressed backups can only be taken on the tape drives.
B.The binary compression creates some performance overhead during backup operation.
C.The ZLIB compression algorithm can be used only if the COMPATIBLE initialization parameter is set to
11.1.0.
D.The media manager compression for the tape drive should be enabled for taking compressed backups
on the tape.
Answer:BD

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

也有遵循题库答案的：
比如：
Riveore的解析：http://blog.csdn.net/rlhua/article/details/19841145

A错，也可以备份在disk上。
C错， only if the COMPATIBLE in itialization parameter is set to 11.1.0，应该是11.0.0或者以上

按Riveore的解析，C选项是错误的，且很有迷惑性。

初步结论：
遵循题库答案，选择BD。