操作系统将对VPA中与所使用的资源相对应的字段进行设置，并在VPA中维护它们的浅副本。
The operating system sets the fields corresponding to the used resources in the VPA and maintains a shallow copy of them in the VPA.
执行活动与管理、维护和操作相关。
Execute activities relate to administering, maintaining, and operating.
下表总结了与每个自动维护操作相关的控制机制
The following table summarizes the control mechanisms relevant to each automatic maintenance operation
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