[单选]
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

液化石油气中含有（）时，它会沉积在容器底部，既增加用户经济负担，又会引起容器底部腐蚀，缩短容器使用年限。硫化氢。甲烷。戊烷。水分。检查空鼓应采用（）的方法。 A.钢尺检测。 B.塞尺检测。 C.拐尺检测。 D.敲击。 You are maintaining your database in Oracle10g. You are not using the recovery catalog to maintain the backup information of your database. Which file can be used as a repository to store information regarding the RMAN backup？（） online redo log files。 alert log files。 control file。 datafiles associated with the SYSTEM tablespace。下面哪个组件不是容器组件（） Form。 Panel。 GroupBox。 Memo。建筑石膏的特性包括（）。凝结硬化快。不溶于水。硬化时体积微膨胀。防火性能好。石膏制品密实度高。

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？（）

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[单选] 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？（）

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[单选]
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？（）