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.
VisualExplain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。
If Visual Explain is not supported for the type of database that you are connected to, a message tells you that it is not available for your data server.
如果VisualExplain不支持您所连接的这个类型的数据库，它会弹出消息告诉您数据服务器不可用。
Plus, DB2 Visual Explain only describes what the database is doing; it doesn't provide insight into the performance ramifications of that choice.
另外，DB 2VisualExplain只描述数据库正在做什么；它并不提供性能调优建议。
The access plan can be collected with the db2expln command line tool or by right-clicking on your database in the DB2 Control Center and choosing the option Explain SQL.
可以通过 db2expln命令行工具，或者在DB2ControlCenter 中右键单击数据库并选择 Explain SQL选项来收集访问计划。
Also, crucially, it can explain to a radiologist how it reached its decision by showing him similar mammograms in the database.
更为可贵的是，它可以通过指出在数据库中的相似图像，来为放射科医生提供诊断依据。
Stop and start the instance, using db2stop and db2start. Create the explain tables again for this DUMMYDB database.
使用db2stop和db2start停止并启动该实例。
The following topics introduce the designers in detail, explain how to work with providers, and link to topics about database connections, objects, and multiuser environments.
下列主题详细介绍各种设计器、说明如何使用提供程序，并链接到数据库连接、对象和多用户环境等相关主题。
The following procedures explain how to create database unit tests for any database object.
下列程序将说明如何为任何资料库物件建立资料库单元测试。
Through introducing the treatment of the attribute data and two main ways that obtain space of data, explain design and foundation course of database in detail.
对于基础数据库的建设，通过介绍属性数据的处理以及空间数据的两种主要获取方式，详细阐述了数据库的设计与建立过程。
At last we provide an example based on hotel customer information management to explain how to realize dynamic access of database by ADO.
基于酒店客户信息管理给出了一个实例阐述如何采用ADO。
At last we provide an example based on hotel customer information management to explain how to realize dynamic access of database by ADO.
基于酒店客户信息管理给出了一个实例阐述如何采用ADO。
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