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As you have probably figured out, you can do a lot to improve query performance. The next problem is obviously finding which queries to tune. To do this effectively, you should use SQL Server Profiler, which is used to listen for events that occur on a SQL Server instance. There are several events that you can listen for, but for tuning, you typically want to use

CREATE TABLE Test.IndexInsertTest ( PKCol UNIQUEIDENTIFIER NOT NULL DEFAULT NEWSEQUENTIALID() PRIMARY KEY CLUSTERED ,Col1 INT NOT NULL ); INSERT Test.IndexInsertTest (Col1) SELECT TOP(1000000) ROW_NUMBER() OVER (ORDER BY message_id) AS Col1 FROM sys.messages AS sm CROSS JOIN ( SELECT TOP(15) 1 AS Col FROM sys.messages ) AS x; -- Rebuild the table s clustered index. ALTER INDEX ALL ON Test.OtherTable REBUILD; -- Created table containing the rows used to perform the inserts. CREATE TABLE Test.OtherTable ( PKCol INT IDENTITY(100000,4) NOT NULL PRIMARY KEY ,OtherCol INT NOT NULL ) INSERT Test.OtherTable (OtherCol) SELECT Col1 FROM Test.IncludedColumnsTest WHERE Col1 BETWEEN 1 AND 10000;

Lesson 1: Configuring Internet Explorer . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2 Lesson 2: Troubleshooting Internet Explorer Problems . . . . . . . . . . . . . . . . 11-23

You want to inspect the DNS cache on a client computer to check for negative cache entries and TTL parameters. How do you perform this task A. Use the Ipconfig /flushdns command-line utility while logged on to the client PC. B. Use the Ipconfig /displaydns command-line utility while logged on to the client PC. C. Open the DNS console. In the console tree, right-click the appropriate server, and select Clear Cache. D. Use the Ipconfig /registerdns command-line utility while logged on to the client PC.

The UpdateService class must include definitions for the two methods in IUpdateService. In both cases, the methods call the already defined private method named update. 6. Add the following code to the region called IUpdateService Members:

Authentication is the process of verifying that the message sender is authentic (that is, that the sender has not been impersonated by another user). MSMQ uses digital sig natures to provide message authentication. MSMQ authentication also guarantees message integrity (that the message has not been tampered with) and nonrepudiation (because no user can sign a message with another user s identity, no user can refute that he or she sent a message if it contains his or her signature). You can configure a queue to accept messages from authenticated users only. When configured to accept only messages from authenticated users, MSMQ checks the user credentials to see if a user certificate is available. If so, MSMQ includes the user certif icate and the SenderId in the message. By default, authentication is only available when the machine that you re sending your message from is in an Active Directory domain. This is because any user that has been authenticated against Active Directory gets an internal user certificate, thus satisfying MSMQ s need for a certificate. This is reflected in the security settings of MSMQ. When running in workgroup mode, the Security tab is unavailable. As shown in Figure 13-16, when connected to a domain three tabs are available: User Certificate, Service Security, and Security.

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The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. Match the end-user request on the left with the solution on the right.

3. Open another query window, and type and execute the following SQL statements to create the Test.spAccountWithdraw stored procedure:

' VB Module Module1 Private OptionalParamHandler As Object = Type.Missing Sub Main() Dim NewExcelApp As New Microsoft.Office.Interop.Excel.Application NewExcelApp.Worksheets.Add(OptionalParamHandler, _ OptionalParamHandler, OptionalParamHandler, _ OptionalParamHandler) End Sub End Module // C# class Program { private static Object OptionalParamHandler = Type.Missing; static void Main(string[] args) { Application NewExcelApp = new Application(); NewExcelApp.Worksheets.Add(ref OptionalParamHandler, ref OptionalParamHandler, ref OptionalParamHandler, ref OptionalParamHandler); } }