Analyzing queries

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Analyzing a Query

The SQL Server Database Engine can display how it navigates tables and uses indexes to access or process the data for a query or other DML statement, such as an update. This is a display of an execution plan. To analyze a slow-running query, it is useful to examine the query execution plan to determine what is causing the problem. For more information about how SQL Server creates and uses execution plans, see SQL Statement Processing and Execution Plan Caching and Reuse.

You can display execution plans by using the following methods:

  • SQL Server Management Studio

    Displays either an estimated graphical execution plan (statements do not execute) or an actual graphical execution plan (on executed statements), which you can save and view in Management Studio.

  • Transact-SQL SET statement options

    When you use the Transact-SQL SET statement options, you can produce estimated and actual execution plans in XML or text.

  • SQL Server Profiler event classes

    You can select SQL Server Profiler event classes to include in traces that produce estimated and actual execution plans in XML or text in the trace results.

 

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