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You notice that a job in a chain has not completed on a nonconstrained RAC database. Which of these are valid reasons why that might occur？（）  
A: The job priority is 1 and the resource consumer group CPU emphasis allocation is a low percentage.
B: The job affinity is to a service and one node in that service is unavailable.
C: The job affinity is to an instance and that instance is unavailable.
D: There is no service affinity.
E: None of the above.

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出自：Oracle认证

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