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 DB2Setup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.
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.
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.
将主数据集呈现给用户后，用户可以开始执行一些任务，完成mashup支持的业务活动。
After the primary data set has been presented to the user, the user can start to perform tasks to accomplish whatever business activity is supported by the mashup.
获取和设置用户的任务集。
执行用户调研时，为一组用户提供测试任务集并记录观察其行为，收集量化测量数据，问卷调查结果，等等。
User studies are conducted with a group of people by giving them a set of test tasks and recording observed behavior, collecting quantitative measurements, results of questionnaires, among others.
执行用户调研时，为一组用户提供测试任务集并记录观察其行为，收集量化测量数据，问卷调查结果，等等。
User studies are conducted with a group of people by giving them a set of test tasks and recording observed behavior, collecting quantitative measurements, results of questionnaires, among others.
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