SQL Server Execution Plans - Red Gate Software

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Chapter 3: Text and XML Execution Plans for Basic Queries Listing 3.12 The information within this element will be familiar to you from the ToolTip window and Properties sheets from the graphical execution plans. Notice that, unlike text plans, which just displayed "EstimateExecutions=0.001581," the XML plan includes the estimated number of rebinds and rewinds. This can often give you a more accurate idea of what occurred within the query, such as how many times the operator executed. For example, for NodeId="20", the final Clustered Index Seek, associated with the Nested Loops join in NodeId="0", we see: Listing 3.13 Returning to Node 0 at the top of the XML, the next element listed is the OutputList element with a list of ColumnReference elements, each containing a set of attributes to describe that column (Listing 3.14). 132
Chapter 3: Text and XML Execution Plans for Basic Queries Listing 3.14 This makes XML not only easier to read, but much more readily translated directly back to the original query. The output described above is from the references to the schema Sales and the tables Customer (aliased as "c"), Store (aliased as "s") and SalesTerritory (aliased as "st"), as well as the schema Person and the table Address (aliased as "a"), in order to output the required columns (CustomerID, Name, Name, and City). The names of the operator elements are the same as the operators you would see in the graphical execution plans, and the details within the attributes are usually those represented in the ToolTip windows or in the Properties window. Finally, for Node 0 in the estimated plan, in Listing 3.15 we see some more information about the Nested Loops operation, such as the table involved, along with the table's alias. Listing 3.15 As you can see, reading plans directly through the XML is not easy. Before moving on to querying the XML directly, let's quickly examine the differences between estimated and actual plans in an XML plan. 133
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SQL Handbooks SQL Server Execution
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First Edition 2008 Copyright Grant
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Chapter 2: Graphical Execution Plan
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Table Hints _______________________
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About the Author Grant Fritchey is
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Foreword I have attended many SQL S
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Introduction Every day, out in the
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If you are specifically looking for
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Some of the code may not work withi
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SQL Server Execution Plans - Red Gate Software

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