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A return value of 1 means you ve met all requirements and can build an index on the view.
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Microsoft SQL Server 2008 Internals
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Creating an Indexed View
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The rst step in building an index on a view is to create the view itself. Here s an example from the AdventureWorks2008 database:
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USE AdventureWorks2008; GO CREATE VIEW Vdiscount1 WITH SCHEMABINDING AS SELECT SUM (UnitPrice*OrderQty) AS SumPrice , SUM (UnitPrice * OrderQty * (1.00 - UnitPriceDiscount)) AS SumDiscountPrice , COUNT_BIG (*) AS Count , ProductID FROM Sales.SalesOrderDetail GROUP BY ProductID;
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Notice the WITH SCHEMABINDING clause and the speci cation of the schema name (Sales) for the table. At this point, we have a normal view a stored SELECT statement that uses no storage space. In fact, if we look at the data in sys.dm_db_partition_stats for this view, we see that no rows are returned:
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SELECT si.name AS index_name, ps.used_page_count, ps.reserved_page_count, ps.row_count FROM sys.dm_db_partition_stats AS ps JOIN sys.indexes AS si ON ps.[object_id] = si.[object_id] WHERE ps.[object_id] = OBJECT_ID ('dbo.Vdiscount1');
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To create an indexed view, you must rst create a unique clustered index. The clustered index on a view contains all the data that makes up the view de nition. This statement de nes a unique clustered index for the view:
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CREATE UNIQUE CLUSTERED INDEX VDiscount_Idx ON Vdiscount1 (ProductID);
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Once the indexed view has been created, re-run the previous SELECT statement to see the pages materialized by the index on the view.
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RESULT: index_name used_page_count reserved_page_count row_count -------------- -------------------- -------------------- --------VDiscountIdx 4 4 266
Data that comprises the indexed view is persistent, with the indexed view storing the data in the clustered index s leaf level. You could construct something similar by using temporary tables to store the data you re interested in. But a temporary table is static and doesn t re ect changes to underlying data. In contrast, SQL Server automatically maintains indexed views, updating information stored in the clustered index whenever anyone changes data that affects the view. After you create the unique clustered index, you can create multiple nonclustered indexes on the view. You can determine whether a view is indexed by using the OBJECTPROPERTY function s IsIndexed property. For the Vdiscount1 indexed view, the following statement returns a 1, which means the view is indexed:
SELECT OBJECTPROPERTY (OBJECT_ID ('Vdiscount1'), 'IsIndexed');
6
Indexes: Internals and Management
Once a view is indexed, metadata about space usage and location is available through the catalog views, just as for any other index.
Using an Indexed View
One of the most valuable bene ts of indexed views is that your queries don t have to reference a view directly to use the index on the view. Consider the Vdiscount1 indexed view. Suppose that you issue the following SELECT statement:
SELECT ProductID, total_sales = SUM (UnitPrice * OrderQty) FROM Sales.SalesOrderDetail GROUP BY ProductID;
The Query Optimizer recognizes that the precomputed sums of all the UnitPrice * OrderQty values for each ProductID are already available in the index for the Vdiscount1 view. The Query Optimizer evaluates the cost of using that indexed view in processing the query, and the indexed view very likely is used to access the information required to satisfy this query the Sales.SalesOrderDetail table might never be touched at all.
Note Although you can create indexed views in any edition of SQL Server 2008, for the Query Optimizer to consider using them even when they aren t referenced in the query, the engine edition of your SQL Server 2008 must be Enterprise, Developer, or Evaluation. Just because you have an indexed view doesn t mean the Query Optimizer will always choose it for the query s execution plan. In fact, even if you reference the indexed view directly in the FROM clause, the Query Optimizer might access the base table directly instead. To make sure that an indexed view in your FROM clause is not expanded into its underlying SELECT statement, you can use the NOEXPAND hint in the FROM clause. Some of the internals of index selection, query optimization, and indexed view usage are discussed in more detail in 8.
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