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Which three statements correctly describe the features of the I/O calibration process？（）
A: Only one I/O calibration process can run at a time
B: It automates the resource allocation for the Automated Maintenance Tasks
C: It improves the performance of the performance-critical sessions while running
D: It can be used to estimate the maximum number of I/Os and maximum latency time for the system
E: The latency time is computed only when the TIMED_STATISTICS initialization parameter is set to TRUE

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出自：Oracle认证

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