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Because a clustered index is the actual table, reading from the clustered index never results in lookups. Therefore, a clustered index should generally be defined on columns that are often queried and typically return a lot of data. Using a clustered index avoids the problem of lookups and fetching a large number of rows. Two good candidates for the clustered index are either the most frequently queried foreign key column of the table (a search on a foreign key typically returns many rows) or the most frequently searched date column. (Date searches typically return a large number of rows as well.) Another important consideration when selecting the column or columns on which to create the clustered index is that the key size of the clustered index should be as small as possible. If a clustered index exists on a table, all nonclustered indexes on that table use the key of the clustered index as the row pointer from the nonclustered index to the table. If a clustered index does not exist, the row identifier is used, which takes up 8 bytes of storage in each row of each nonclustered index. This can significantly increase the index size for larger tables. Consider the following scenario:

Summary

Xml.XmlElement anElement;

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The Service method help page can be used to invoke your Web methods but can also be used to inspect sample SOAP messages for both the SOAP 1.1 and 1.2 specifications. The .NET Framework 2.0 provides an attribute mechanism to alter the format ting of your SOAP messages. The System.Web.Services.Protocols namespace includes the SoapDocumentMethodAttribute and SoapRpcMethodAttribute classes, which represent the SoapDocumentMethod and SoapRpcMethod. You can build a Web service that complies with the WS-I Basic Profile by using the WebServiceBinding attribute on your Web service class file. The System.Xml.Serialization namespace contains the XmlSerializer class, which is the underlying transport mechanism for Web services built with the .NET Framework 2.0. The XmlSerializer class can be used to customize SOAP mes sages using the XmlElement attribute. SOAP headers are optional according to the SOAP 1.1 and 1.2 specifications, but if you choose to include them, you can implement a custom class file that inher its from the System.Web.Services.Protocols.SoapHeader namespace. The Web method that implements the custom SOAP header will use the SoapHeader attribute to reference the custom class file. You can further customize your Web services by using a custom SOAP extension class that derives from the System.Web.Services.Protocols.SoapExtension class. This class will be implemented in a class library project that represents the SOAP extension.

You have a table with 40,000,000 rows. The table has five nonclustered indexes. The clustered index key is 60 bytes wide. (This is not uncommon when you have clustered indexes that span a few columns.)

Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.

Xml.XmlText aText;

binding deserialization encapsulation encoding enumeration (also known as enum) metadata serialization XML Infoset

The total size of all row pointers from the nonclustered indexes on this table (only the pointers nothing else) would be 40,000,000 * 5 * 60 = 12,000,000,000 bytes (close to 12 gigabytes) If the clustered index key were changed to only one column with a smaller data type, such as an integer for a foreign key, each row pointer would be only 4 bytes. Because 4 bytes are added to all duplicates of the clustered index key to keep it unique internally, the clustered index key size that actually results would be 8 bytes. The total size of all row pointers would then be as follows: 40,000,000 * 5 * 8 = 1,600,000,000 bytes (close to 1.5 GB) The reduction in storage needed is more than 10 GB.

In the following case scenarios, you apply what you ve learned about how to create custom SOAP headers and SOAP extensions. You can find answers to these questions in the Answers section at the end of this book.

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