This is an optimization that was introduced in DB2 for z/OS V9.1, which enables DB2 to optimize a query as a whole rather than as several independent query blocks.

这是 DB2 for z/OS V9.1 中 引入的优化，它能让 DB2 将查询作为一个整体，而非几个单独的查询段来优化。

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Often one is able to activate OS-independent Power Management in the BIOS, but an intelligent setup in the operating system adapting to different situations can achieve much more.

通常人们在BIOS设置里可以激活一些电源管理，但在操作系统里的智能设置可使你达到更高的目标。

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To see how the separation of architecture specific OSs. and architecture independent parts can be implemented, consider the nature of a typical OS component.

为理解与结构相关的部分和与结构无关的部分是如何分开的，我们考虑一下一个典型操作系统组件的特性。

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