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You have created a resource plan， DB_PLAN， using DBMS_RESOURCE_MANAGER.CREATE_SIMPLE_PLAN and you want to impose a restriction on utilization of resources by the database users.   Which step must be performed before you can start using the resource plan？（）
A:assign users to consumer groups
B:set the resource plan for the instance
C:configure a simple resource plan and specify plan directives
D:configure a complex resource plan and specify plan directives

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出自：Oracle认证

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