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In addition to making data modifications through a view, you can also create an index on a view. However, an index cannot be created on a partitioned view because the member tables can span databases and SQL Server instances.

Until this chapter, the primary focus of this book has been on building and configuring Windows Communication Foundation (WCF) services. However, the value of service orientation is to make certain capabilities (services) available for use (or consumption) in other programs, so in this chapter, the emphasis shifts to consuming services. The chapter begins with coverage of the mechanics of creating proxies to services and then discusses what you ll need to know to consume services effectively, using those proxies. Because one of the most powerful aspects of Extensible Markup Language (XML)-based Web services is that their consumption does not impose any platform, technology, or operating system constraints, the chapter will close with a look at how WCF can be used to consume services built on other platforms.

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When a regular view is created, SQL Server stores only the definition of the view, which is then substituted by the optimizer for SELECT statements issued against the view. An index can be built against a list of values in a column. When you index a view, SQL Server executes the SELECT statement defined by the view, stores the result set, and then builds the index. Any subsequent DML issued against any of the tables the view is defined against causes SQL Server to update the stored result set incrementally, as well as maintain the index, if necessary. Because SQL Server physically stores and maintains the result set, or materializes the data, an indexed view is sometimes referred to as a materialized view. Indexed views have a very long list of requirements. The requirements for an indexed view derive from the fact that the data has to be materialized to disk in an unchanging manner and the data within the index also has to be fixed. Some of the requirements for creating an indexed view are as follows:

Exam objectives in this chapter:

The SELECT statement cannot reference other views. All functions must be deterministic. AVG, MIN, MAX, STDEV, STDEVP, VAR, and VARP are not allowed. The index created must be both clustered and unique. ANSI_NULLS must have been set to ON when the view and any tables referenced by the view were created. The view must be created with the SCHEMABINDING option. The SELECT statement must not contain subqueries, outer joins, EXCEPT, INTERSECT, TOP, UNION, ORDER BY, DISTINCT, COMPUTE/COMPUTE BY, CROSS/OUTER APPLY, PIVOT, or UNPIVOT.

Lessons in this chapter:

The complete list of restrictions for creating an indexed view can be found in the SQL Server Books Online article Creating Indexed Views, at http://msdn.microsoft.com/en-us/ library/ms191432.aspx.

Lesson 1: Consuming WCF Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 Lesson 2: Consuming Non-WCF Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Meeting the requirements for creating an indexed view may seem prohibitive. However, the main advantage of an indexed view is that the data is already materialized and does not have to be calculated on the fly, as with a regular view. Indexed views can provide a significant performance gain when you have queries that combine large volumes of data, such as with aggregates. Indexed views have to be maintained when changes occur to the underlying tables, so an indexed view shouldn t be created against tables that receive large volumes of data modifications.

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