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.
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.
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