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Your database instance is functional for the past one month. The Automatic Workload Repository（AWR） snapshot retention is set to 7 and the STATISTICS_LEVEL initialization parameter is set to TYPICAL.  You receive a complaint about the poor performance of the database between 7 PM and 9 PM of theprevious day.  Choose two actions any of which can be referred to first to diagnose the problem. （）
A:Use the Active Session History report.
B:Use the AWR Compare Periods report.
C:Use an ADDM analysis between 7 PM and 9 PM of the previous day.
D:Use the AWR Compare Period report between 7 PM and 9 PM of the previous day.

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出自：Oracle认证

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