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.

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。

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A thread is an encapsulation of the flow of control in a program. you might be used to writing single-threaded programs - that is, programs that only execute one path through their code "at a time".

线程是程序中的控制流程的封装。你可能已经习惯于写单线程程序，也就是，程序在它们的代码中一次只在一条路中执行。

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