db2_install 实用程序可以安装 DB2 文件集，但是不创建实例和用户，也不会执行任何其他由 DB2 Setup 向导执行的配置任务。

The db2_install utility installs the DB2 file sets, but does not create an instance, users, or perform any other configuration tasks performed by the DB2 Setup wizard.

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开销（overhead）任务，如数据库设置和用户界面设计，需要不少的技巧集。

Overhead tasks such as database setup and user interface design require no small set of skills.

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大块的结果集可以进行外部排序，reduce()任务遍历整个排序的数据，把每个唯一的键和分类的结果传递到用户的reduce() 函数子进行处理。

Very large results may be externally sorted. The task iterates over the sorted data and passes each unique key and collated results to the users’s reduce() functor for processing.

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