You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference. Which method or feature should you use?（）<br>A:Compare Period ADDM report<br>B:AWR Compare Period report<br>C:Active Session History (ASH) report<br>D:Taking a new snapshot and comparing it with a preserved snapshot

You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference. Which method or feature should you use?（）
A:Compare Period ADDM report
B:AWR Compare Period report
C:Active Session History (ASH) report
D:Taking a new snapshot and comparing it with a preserved snapshot

出自：Oracle认证

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