You have created a baseline metric， DISK_IO_BL， for the disk I/O metrics in your PROD database and you have been getting notifications whenever the database performance degrades. You optimize the database I/O to gain the performance and you decide to remove the baseline metrics. Which method would you use to remove the DISK_IO_BL baseline metrics？（）
A. The baseline， once created， cannot be removed.
B. Disable the baseline metrics in the Database Control Manage Metrics page.
C. The baseline will be automatically removed once the database performance has been optimized.
Drop the baseline metrics by usingDBMS_WORKLOAD_REPOSITORDROP_BASELINE procedure.
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油箱中隔框上的单向活门的作用是（）
A. 飞机在任何姿态下使燃油从油箱外侧流向内侧
B. 飞机在任何姿态下使燃油从油箱高处流向低处
C. 以上全正确
D. 以上都不正确
每侧油箱有几个燃油油量传感器
A. 3
B. 4
C. 5
D. 6
Which two statements are true about Oracle Managed Files (OMF)?（）
A. OMF cannot be used in a database that already has data files created with user-specified directions.
B. The file system directions that are specified by OMF parameters are created automatically.
C. OMF can be used with ASM disk groups, as well as with raw devices, for better file management.
D. OMF automatically creates unique file names for table spaces and control files.
E. OMF may affect the location of the redo log files and archived log files.
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