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Which statement is true regarding the creation of nested plans using Resource Manager？（）
A: Only one nested subplan is allowed.
B: The plans can be nested up to four levels.
C: Resource Manager does not support nested plans.
D: Nested plans control only the degree of parallelism but not the CPU.
E: Each nested plan gets a proportion of the CPU resources assigned to its parent group.

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出自：Oracle认证

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