conf文件中包括一系列全局配置选项，它们作为一个整体应用到slapd上面，后面是包含数据库特有信息的数据库后端定义。
File consists of a series of global configuration options that apply to slapd as a whole, followed by a database backend definition that contains information specific to our database.
总的来说，一个计算机系统是由不同的“子系统”组成的，因此程序员需要掌握一些设计技巧或者自上而下的思维方法，这样才能从整体上把握全局。
Generally, a computer system is comprised of different "sub" systems so a programmer needs to have some design or top-down thinking skills to see the program from the larger picture.
用全局观训练你对程序整体过程的把握，这也使你能够跳出程序之外清楚地说出“我理解这个程序需要做的事情。”
Taking the holistic view helps sharpen your intuition about the programming process and enables you to stand back from a program and say, “I understand what this program does.
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