SQL Server Execution Plans - Grant Fritchey - SQLServerCentral.com

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Chapter 4: Understanding More Complex Query PlansAS ( SELECT e.[BusinessEntityID] ,e.[OrganizationNode] ,p.[FirstName] ,p.[LastName] ,0 -- Get the initial list of Employees-- for Manager nFROM [HumanResources].[Employee] eINNER JOIN [Person].[Person] pON p.[BusinessEntityID] =e.[BusinessEntityID]WHERE e.[BusinessEntityID] = @BusinessEntityIDUNION ALLSELECT e.[BusinessEntityID] ,e.[OrganizationNode] ,p.[FirstName] ,p.[LastName] ,[RecursionLevel] + 1 -- Join recursive-- member to anchorFROM [HumanResources].[Employee] eINNER JOIN [EMP_cte] ONe.[OrganizationNode].GetAncestor(1) =[EMP_cte].[OrganizationNode]INNER JOIN [Person].[Person] p ONp.[BusinessEntityID] = e.[BusinessEntityID])SELECT [EMP_cte].[RecursionLevel] ,[EMP_cte].[OrganizationNode].ToString()AS [OrganizationNode] ,p.[FirstName] AS 'ManagerFirstName' ,p.[LastName] AS 'ManagerLastName' ,[EMP_cte].[BusinessEntityID] ,[EMP_cte].[FirstName] ,[EMP_cte].[LastName] -- Outer select from the CTEFROM [EMP_cte]INNER JOIN [HumanResources].[Employee] eON [EMP_cte].[OrganizationNode].GetAncestor(1) =e.[OrganizationNode]INNER JOIN [Person].[Person] pON p.[BusinessEntityID] = e.[BusinessEntityID]ORDER BY [RecursionLevel] ,[EMP_cte].[OrganizationNode].ToString()OPTION ( MAXRECURSION 25 )END;Listing 4.6150
Chapter 4: Understanding More Complex Query PlansLet's execute this procedure, capturing the actual XML plan.SET STATISTICS XML ON;GOEXEC [dbo].[uspGetEmployeeManagers] @EmployeeID = 9;GOSET STATISTICS XML OFF;GOListing 4.7We get an execution plan of reasonable complexity, so let's break it down into sections inorder to evaluate it. We will examine parts of the XML plan alongside the graphical plan.Figure 4.9 displays the top right-hand section of the graphical plan.Figure 4.9A Nested Loops join takes the data from two Clustered Index Seeks againstHumanResources.Employee and Person.Person. The Scalar operator puts inthe constant "0" from the original query for the derived column, RecursionLevel.The second scalar, carried to a later operator, is an identifier used as part of theConcatenation operation.151
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SQL HandbooksSQL ServerExecution Pl
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First Edition 2008Copyright Grant F
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Chapter 2: Graphical Execution Plan
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Table Hints________________________
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About the AuthorGrant Fritchey is a
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ForewordI have attended many SQL Se
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IntroductionEvery day, out in the v
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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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