介绍了专用的数据文件管理器和计算结果管理器的功能和作用。

It introduces the functions of appropriative data files manager and calculated results manager.

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首先，选择从“文件”菜单上选择“数据文件管理”，会跳出一个窗口显示你数据文件的名称，其中包括了它们在硬盘上的位置。

First, select 'data file Management' from the file menu. A window will open showing the name of your data file, which includes its location on your hard disk.

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用于访问外部表的权限由IDS通过外部表上的用户访问特权治理，还受到由操作系统管理的数据文件权限的治理。

The permissions used to access external tables is governed by the user access privileges on the external table by IDS as well as the data file permissions managed by the operating system.

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We transition to actually real world applications later on like a compression-- how do you take a huge amount of data ; and actually whittle it down into something more manageable; something that uses less of your disk space.

然后我们会讲生活中的应用程序,比方说压缩文件——,把大量的数据分解使其更易管理;,并占用尽量少的磁盘空间。

哈佛公开课 - 计算机科学课程节选