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CREATE NONCLUSTERED INDEX TestIndex ON Test.TableA (Col1, Col2); CREATE NONCLUSTERED INDEX TestIndex ON Test.TableA (Col2, Col1); CREATE NONCLUSTERED INDEX TestIndex ON Test.TableA (Col1) INCLUDE (Col2); CREATE NONCLUSTERED INDEX TestIndex ON Test.TableA (Col2) INCLUDE (Col1); CREATE NONCLUSTERED INDEX TestIndex ON Test.TableA (Col1, Col2, Col3); CREATE NONCLUSTERED INDEX TestIndex ON Test.TableA (Col3) INCLUDE (Col1, Col2);

The class that inherits from the SoapExtensionAttribute method can be placed within the same class file as your CustomSoapExtension. The code that would be added to the class is as follows:

'VB <AttributeUsage(AttributeTargets.Method)> _ Public MustInherit Class TestSoapExtensionAttribute Inherits System.Web.Services.Protocols.SoapExtensionAttribute Public Overrides ReadOnly Property ExtensionType() As System.Type

9

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As you can see, the columns only need to be found in the index; their position and whether they are found in the index key or are included columns (discussed in detail in the section entitled Using Included Columns and Reducing Index Depth later in this lesson) does not matter. Of course, both the execution plan and the performance could differ greatly between these indexes; however, they all cover the query. The performance benefit gained by using a covered index is typically great for queries that return a large number of rows (a nonselective query) and smaller for queries that return few rows (a selective query). Remember that a small number of rows is a relative term it could mean 10 for a table with a couple of hundred rows and 1,000 for a table with millions of rows. This section presents a performance comparison of four queries. The table that the queries are executed against has the following schema and is populated with 1,000,000 rows:

Return GetType(CustomSoapExtension)

Set(ByVal value As Integer)

CREATE TABLE Test.CoveredIndexTest ( Col1 INT NOT NULL ,Col2 NVARCHAR(2047) NOT NULL ); INSERT Test.CoveredIndexTest (Col1, Col2) VALUES (0, 'A lonely row...'); INSERT Test.CoveredIndexTest (Col1, Col2) SELECT TOP(999999) message_id, text FROM sys.messages AS sm CROSS JOIN ( SELECT TOP(15) 1 AS Col FROM sys.messages ) AS x;

// C# myWriter.WriteStartElement("colors"); myWriter.WriteElementString("color", "blue"); myWriter.WriteEndElement();

End Class //C# [AttributeUsage(AttributeTargets.Method)] public class TestSoapExtensionAttribute : SoapExtensionAttribute { public override int Priority {

get { return 1; }

On the test machine in this example, the size of this table is 27,377 pages (roughly 213 megabytes). Also, note that the table is a heap; that is, it does not have a clustered index defined on it. The queries and indexes used in this test have the definitions shown in the following code. The performance metrics (measured in page reads) for the queries are shown in Table 6-4.

set { }

' VB myWriter.WriteStartElement("colors") myWriter.WriteElementString("color", "blue") myWriter.WriteEndElement("colors") // C# myWriter.WriteStartElement("colors"); myWriter.WriteElementString("color", "blue"); myWriter.WriteEndElement("colors");

--Non-covered index: CREATE NONCLUSTERED INDEX NonCovered ON Test.CoveredIndexTest (Col1);

get { return typeof(CustomSoapExtension); }

You can attach the newly created SoapExtensionAttribute to a particular Web method to indicate that the method uses the SOAP extension. The following code shows how this can be done for the HelloWorld Web method:

' VB myWriter.WriteElementString("colors") myWriter.WriteElementString("color", "blue") myWriter.WriteElementString("/colors") // C# myWriter.WriteElementString("colors"); myWriter.WriteElementString("color", "blue"); myWriter.WriteElementString("/colors");

--Covered index: CREATE NONCLUSTERED INDEX Covered ON Test.CoveredIndexTest (Col1) INCLUDE (Col2); -- Query 1: -- Returns 1 row. SELECT Col1, Col2 FROM Test.CoveredIndexTest WHERE Col1 = 0;

'VB <WebMethod> _ <CustomSoapExtensionAttribute()> Public Function HelloWorld() As String Return "Hello World" End Function //C# [WebMethod]

2

-- Query 2: -- Returns roughly 0.1% of the rows found in the table. -- (1,056 rows) SELECT Col1, Col2 FROM Test.CoveredIndexTest WHERE Col1 BETWEEN 1205 AND 1225;

' VB myWriter.WriteStartElement("colors") myWriter.WriteStartElement("color", "blue") myWriter.WriteEndElement() // C# myWriter.WriteStartElement("colors"); myWriter.WriteStartElement("color", "blue"); myWriter.WriteEndElement();

[CustomSoapExtensionAttribute()]

-- Query 3: -- Returns roughly 0.5% of the rows found in the table. -- (5,016 rows) SELECT Col1, Col2 FROM Test.CoveredIndexTest WHERE Col1 BETWEEN 1205 AND 1426;

public string HelloWorld()

The XML document object model (DOM) is a hierarchical representation of a flat XML file. Platform-specific implementations of the XML DOM allow you to navigate the XML document, perform complicated searches, and modify the XML structure in a nonlinear fashion. The .NET Framework allows access to the XML DOM through the XmlDocument class.

return "Hello World";

-- Query 4 (non-selective): -- Returns roughly 5% of the rows found in the table. -- (50,028 rows) SELECT Col1, Col2 FROM Test.CoveredIndexTest WHERE Col1 BETWEEN 1205 AND 2298;

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