Tuesday, December 30, 2008

How do we see the SQL Plan in textual format?

 


SET SHOWPLAN_TEXT ON


To quickly analyze a slow-running query, examine the query execution plan to determine what is causing the problem.



SET SHOWPLAN_TEXT causes SQL Server to return detailed information about how the statements are executed.

Example

USE Northwind;
GO
SET SHOWPLAN_TEXT ON;
GO
SELECT *
FROM Customers
WHERE CustomerID = 'ALFKI';
GO
SET SHOWPLAN_TEXT OFF;
GO

Displays how indexes are used:
--Clustered Index Seek(OBJECT:([Northwind].[dbo].[Customers].[PK_Customers]), SEEK:([Northwind].[dbo].[Customers].[CustomerID]=CONVERT_IMPLICIT(nvarchar(4000),[@1],0)) ORDERED FORWARD)

Some Important Points :

1. SET SHOWPLAN_TEXT cannot be specified when using a stored procedure

2. You need to have the SHOWPLAN permission while running SET SHOWPLAN_TEXT

 

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