在DB 2 9.1中，只有在建立了表字典之后(表字典通常是在表reorg阶段建立的)，压缩才能生效。

In DB2 9.1, the compression takes effect only after the table dictionary is built, which is usually during the table REORG phase.

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需求分析工具用于软件工程的需求分析阶段，它的基本功能是辅助系统分析人员对开发的系统需求进行分析，最终得到由数据流图和数据字典组成的完整而准确的软件需求规约。

Its basic function is to assist system analyst to analyze the requirement of the developed system, and to get an intact and accurate software requirement specification which is made up of Data Fl.

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他有六个助手协助他，其中两个在字典的编撰的筹备阶段就去世了。

He was also helped by six assistants, two of whom died whilst the dictionary was still in preparation.

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