Lesson 3: Creating an Indexed View in Visual Studio .NET

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Lesson 3: Creating an Indexed View
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The SELECT statement cannot reference other views. All functions must be deterministic. For example, you cannot use getdate() because every time it is executed, it returns a different date result. AVG, MIN, MAX, and STDEV are not allowed.
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You use the CREATE INDEX Transact-SQL command to create a clustered index on a view. For details about this command, see 4, Creating Indexes. You can also create nonclustered indexes on a view to give the query optimizer more options for satisfying a query. You also use the CREATE INDEX command to create nonclustered indexes on a view.
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Lesson 1, Creating a View, discussed the query substitution that happens when a SELECT statement references a regular view. Indexed views work differently because an indexed view is, in fact, a table. So queries that reference the indexed view return the data directly from the view. The query optimizer does not substitute the view definition into the query. Although you can create an indexed view in any version of SQL Server 2005, Enterprise Edition contains an interesting optimizer feature. If the optimizer determines that it can use an indexed view more efficiently to satisfy a query than a base table, it will rewrite the query to use the indexed view instead. You do not even have to specify the indexed view in the query; the query needs to specify only a table on which you have defined an indexed view. The practice in this lesson demonstrates this substitution behavior, which is available only if you are using the Enterprise or Developer editions of SQL Server 2005. To use an indexed view in any other edition of SQL Server, you must explicitly reference it in the query.
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What is the difference between a regular view and an indexed view A regular view is a SELECT statement that is referenced by a name and stored in SQL Server. It does not contain any data. An indexed view is a view that has a clustered index created against it, which causes SQL Server to materialize and store the results of the query defined in the view on disk. An indexed view must meet very stringent requirements for the view, the base tables that the view references, and the index on the view.
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Implementing Views
PRACTICE
Create an Indexed View
In this practice, you create an indexed view in the AdventureWorks database. 1. If necessary, launch SSMS, connect to your instance, open a new query window, and change the context to the AdventureWorks database. 2. Create an indexed view called Orders by executing the following code:
--Set the options to support indexed views. SET NUMERIC_ROUNDABORT OFF; SET ANSI_PADDING, ANSI_WARNINGS, CONCAT_NULL_YIELDS_NULL, ARITHABORT, QUOTED_IDENTIFIER, ANSI_NULLS ON; GO --Create view with schemabinding. IF OBJECT_ID ('Sales.vOrders', 'view') IS NOT NULL DROP VIEW Sales.vOrders ; GO CREATE VIEW Sales.vOrders WITH SCHEMABINDING AS SELECT SUM(UnitPrice*OrderQty*(1.00-UnitPriceDiscount)) AS Revenue, OrderDate, ProductID, COUNT_BIG(*) AS COUNT FROM Sales.SalesOrderDetail AS od, Sales.SalesOrderHeader AS o WHERE od.SalesOrderID = o.SalesOrderID GROUP BY OrderDate, ProductID; GO --Create an index on the view. CREATE UNIQUE CLUSTERED INDEX IDX_V1 ON Sales.vOrders (OrderDate, ProductID); GO
3. Execute the following queries, which use the indexed view even though the view is not explicitly referenced in the queries:
SELECT SUM(UnitPrice*OrderQty*(1.00-UnitPriceDiscount)) AS Rev, OrderDate, ProductID FROM Sales.SalesOrderDetail AS od JOIN Sales.SalesOrderHeader AS o ON od.SalesOrderID=o.SalesOrderID AND ProductID BETWEEN 700 and 800 AND OrderDate >= CONVERT(datetime,'05/01/2002',101) GROUP BY OrderDate, ProductID ORDER BY Rev DESC; SELECT OrderDate, SUM(UnitPrice*OrderQty*(1.00-UnitPriceDiscount)) AS Rev FROM Sales.SalesOrderDetail AS od JOIN Sales.SalesOrderHeader AS o ON od.SalesOrderID=o.SalesOrderID AND DATEPART(mm,OrderDate)= 3 AND DATEPART(yy,OrderDate) = 2002 GROUP BY OrderDate ORDER BY OrderDate ASC;
Lesson 3: Creating an Indexed View
Lesson Summary
You create an indexed view by creating a clustered index on the view. By creating a clustered index on a view, SQL Server stores the result set of querying the view on disk, which can dramatically improve performance, especially for queries that perform aggregations or computations. If you are using SQL Server 2005 Enterprise Edition, the query optimizer will automatically rewrite a query to use an indexed view if it determines that the indexed view would be more efficient than the base table in satisfying the query.
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