访问路径图不但描述“操作细节”，而且描述数据如何流动。
An access path graph not only describes the "operational details" of query execution, it also describes how the data flows.
清单6中的sql语句创建如图6所示的访问路径图。
The SQL statement in Listing 6 creates the access path graph shown in Figure 6.
清单5中的sql语句创建如图5所示的访问路径图。
The SQL statement in Listing 5 creates the access path graph shown in Figure 5.
清单4中的sql语句创建如图4所示的访问路径图。
The SQL statement in Listing 4 creates the access path graph shown in Figure 4.
清单8中的sql语句创建如图8所示的访问路径图。
The SQL statement in Listing 8 creates the access path graph shown in Figure 8.
本文描述了访问路径的基本概念以及如何解读访问路径图。
This article described the basic concepts of access paths and how to read an access path graph.
清单3中的SQL语句创建如图 3所示的访问路径图
The SQL statement in Listing 3 creates the access path graph shown in Figure 3.
图6是QueryTuner为本文中大的查询样例生成的访问路径图。
Figure 6 is the access path graph generated by query Tuner for the sample query in this article.
在图2中，表节点的描述符和TBSCAN节点的描述符显示在访问路径图的左侧。
In Figure 2, the descriptor for the table node and the descriptor for the TBSCAN node are shown to the left of the access path graph.
数据从下往上流动(如访问路径图所示)并通过访问路径图上的操作节点处理。
Data flows from the bottom up (as displayed in the graph) and is processed by operation nodes in the access path graph.
每一个操作的描述都包括一个解释其操作语义的QueryTuner访问路径图。
The description of each operation includes a Query Tuner access path graph that explains its operational semantics.
图1是通过清单1所示的适用于查询的OptimQueryTuner生成的访问路径图。
Figure 1 is the access path graph generated by Optim query Tuner for the query shown in Listing 1.
如果您想有机会亲自与访问路径图互动，则它们包含在示例项目文件中，您可以从本文的下载部分获得。
If you want the opportunity to interact with the access path diagrams yourself, they are included in a sample project file that you can obtain from the download section of this article.
同样，访问路径图的最后一步要评估8次，通过第一个NLJOIN节点产生的每条记录都要评估一次。
Similarly, the last leg in the access path graph is evaluated eight times, once for each record produced by the first NLJOIN node.
本部分说明QueryTuner查询注释和访问路径图如何帮助您分析访问路径和SQL性能。
This section illustrates how the query Tuner query annotation and access path graph can help you analyze access paths and SQL performance.
本节的其余部分再一次以数据流的观点向您介绍访问路径图以便您可以在查询执行的性能方面获得充分的理解。
The rest of this section takes you through the access path graph one more time from the data flow perspective so that you can gain a full understanding of the performance aspect of query execution.
清单2中的sql语句创建如图2上的OptimQueryTuner截图右侧所示的访问路径图。
The SQL statement in Listing 2 creates the access path graph shown on the right side of the Optim Query Tuner screenshot in Figure 2.
由算法找出有向图最佳的访问路径和访问点，实现网站的优化。
Furthermore, by using an algorithm, the best visit routes and points can be found to optimize the websites.
由算法找出有向图最佳的访问路径和访问点，实现网站的优化。
Furthermore, by using an algorithm, the best visit routes and points can be found to optimize the websites.
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