• 1. single step execution: 单步执行

• 1.Deploy a broker archive (BAR) file to multiple execution groups in a single step.
  一步完成将一个代理归档(BAR)文件部署到多个执行组。
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• 2.Request metrics provide a mechanism to trace the flow of execution of a single request through the system, and measure the processing time at each step of that flow.
  请求度量提供了一种机制，用于跟踪单个请求在通过系统时的执行流，并度量执行流中每一步骤的处理时间。
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• 3.The next step is to create an instance of QueryExecution, a class that represents a single execution of a query.
  下一步是创建QueryExecution的实例，这个类表示查询的一个执行。
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