在看AWR 报告时一直对cpu+wait for cpu有所疑问。从字面看感觉是cpu忙，但实际上在做monitoring的时候cpu还可以。问了一下oracle的工程师，给到的回答如下：

"wait" processes just mean that there are CPUs waiting around for work to do - the "wait" processes up all the idle time of your system.

答案很清除了。

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