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You plan to control idle sessions that are blocking other sessions from performing transactions. Your requirement is to automatically terminate these blocking sessions when they remain idle for a specified amount of time.  How would you accomplish this task？（）  
A: Set metric threshold
B: Implement Database Resource Manager
C: Enable resumable timeout for user sessions
D: Add directives to Automatic Database Diagnostic Monitor （ADDM）

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出自：Oracle认证

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