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You work as a database administrator at Certkiller .com. In your production database， you observe that users’ transactions are consuming a lot of resource and you plan to impose resource restrictions by using Resource Manager. For which three resources can you enable usage restrictions by using Resource Manager？ （）
A: CPU usage
B: degree of parallelism
C: number of open cursors
D: number of sorts performed
E: idle time for blocking sessions
F: number of disk I/O operations performed
G: number of memory I/O operations performed

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出自：Oracle认证

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