Even though the goal of this article is not to explain how a relational database works in detail, a brief overview is in order.
尽管本文的目的不是要详细地解释关系数据库如何运作，但做一个简短的概述还是适宜的。
Before you can use this tool, you must create the EXPLAIN tables for the database.
使用该工具前必须创建数据库的explain表。
Visual Explain also includes information on the database objects considered and chosen by the query optimizer.
Visual Explain还包括关于查询优化器所考虑和选择的数据库对象的信息。
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