150.You have enabled backup optimization in RMAN. You issue the following RMAN command to
configure a redundancy-based retention policy:
CONFIGURE RETENTION POLICY TO REDUNDANCY 3;
Which statement is true?
A. The command fails because you cannot configure a redundancy-based retention policy when backup optimization is enabled
B. Backup optimization is performed, but RMAN considers the redundancy-based retention policy when it determines which datafiles should be backed up
C. Backup optimization is permanently disabled
D. Backup optimization is temporarily disabled because a redundancy-based retention policy is specified
Answer: B
答案解析：
备份优化开启和基于冗余的保留策略并不矛盾，
当决定数据文件什么时候应该备份时，是由基于冗余策略的配置决定的。