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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.
D:Drop the baseline metrics by usingDBMS_WORKLOAD_REPOSITORY.DROP_BASELINE procedure.

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出自：Oracle认证

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