SQL Server Execution Plans - Red Gate Software

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Chapter 8: Advanced Topics p.[LastName] AS ''ManagerLastName'', [EMP_cte].[BusinessEntityID], [EMP_cte].[FirstName], [EMP_cte].[LastName] -- Outer select from the CTE FROM [EMP_cte] INNER JOIN [HumanResources].[Employee] e ON [EMP_cte].[OrganizationNode].GetAncestor(1) = e.[OrganizationNode] INNER JOIN [Person].[Person] p ON p.[BusinessEntityID] = e.[BusinessEntityID] ORDER BY [RecursionLevel], [EMP_cte].[OrganizationNode].ToString() OPTION (MAXRECURSION 25) ', @type = N'OBJECT', @module_or_batch = N'dbo.uspGetManagerEmployees', @params = NULL, @hints = N'OPTION(RECOMPILE,MAXRECURSION 25)' Listing 8.13 First, we use the @name parameter to give our plan guide a name, in this case MyFirstPlanGuide. Note that plan guide names operate within the context of the database, not the server. The @stmt parameter has to be an exact match to the query that the query optimizer will be called on to match. White space and carriage returns don't matter but, in order to create the above, I had to include the CTE. Without it, I was getting errors. When the optimizer finds code that matches, it will look up and apply the correct plan guide. The @type parameter is going to be a database object, so this is an object plan guide. In the @module_or_batch parameter, we specify the name of the target object if we're creating an object plan guide, as in this case. We supply null otherwise. We use @params only if we're using a template plan guide and forced parameterization. Since we're not, it's null in this case. If we were creating a template, this would be a comma-separated list of parameter names and data types. Finally, the @hints parameter specifies any hints that need to be applied. We apply the RECOMPILE hint, but notice that this query already had a hint, MAX RECURSION. That hint had also to be part of my @stmt in order to match what was inside the stored procedure. The plan guide replaces the existing OPTION; so if, like in this case, we need the existing OPTION to be carried forward, we need to add it to the plan guide. 312
Chapter 8: Advanced Topics From this point forward, without making a single change to the actual definition of the stored procedure, each execution of this procedure will be followed by a recompile. You can identify that a guide has been used by looking at the Select operator of the resulting execution plan. If we were to execute the query as shown in Listing 8.14, it would result in the information shown in Figure 8.11 being on display in the execution plan's Select operator. EXEC dbo.uspGetManagerEmployees @BusinessEntityID = 42 -- int Listing 8.14 Figure 8.11 So, you can see if a plan guide was applied to a stored procedure. 313
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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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Chapter 1: Execution Plan Basics Wh
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The query optimizer Chapter 1: Exec
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Execution Plan Formats Chapter 1: E
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Getting Started Chapter 1: Executio
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Figure 1.5 Chapter 1: Execution Pla
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SET SHOWPLAN_ALL ON; Listing 1.5 Ch
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Interpreting XML plans Chapter 1: E
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Table Scan Chapter 2: Graphical Exe
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INSERT statements Chapter 2: Graphi
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Figure 4.24 Chapter 4: Understandin
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Figure 5.3 Chapter 5: Controlling E
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Figure 5.8 Chapter 5: Controlling E
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Figure 5.10 Chapter 5: Controlling
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OPTION ( FAST 10 ); Listing 5.16 Fi
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Listing 5.17 Chapter 5: Controlling
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OPTION ( MAXDOP 1 ); Listing 5.20 C
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NOEXPAND Chapter 5: Controlling Exe
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INDEX() Chapter 5: Controlling Exec
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Chapter 6: Cursor Operations Most o
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Logical operators Chapter 6: Cursor
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Figure 6.4 Chapter 6: Cursor Operat
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OPEN CurrencyList FETCH NEXT FROM C
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Physical operators Chapter 6: Curso
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Figure 6.14 Chapter 6: Cursor Opera
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Population Query Chapter 6: Cursor
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Figure 6.18 Keyset cursor Chapter 6
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Chapter 6: Cursor Operations The ma
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DECLARE CurrencyList CURSOR READ_ON
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END Chapter 6: Cursor Operations IF
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DECLARE ChangeData CURSOR STATIC Li
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Chapter 7: Special Datatypes and Ex
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FOR XML Chapter 7: Special Datatype
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