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Indexes are an essential component for ensuring optimum query execution. Proper indexing often is the difference between substandard query execution and exceptional query execution. However, unlike other objects created in SQL Server 2005, indexes can lose their effectiveness over time if they are not properly maintained because of fragmentation of the index pages supporting the indexes. The level of index fragmentation and the degree of index maintenance you perform as a DBA often determine which indexes the SQL Server query optimizer uses to execute the query successfully and which indexes the optimizer does not use for any queries. The optimizer could also end up using indexes that have a large degree of fragmentation, which actually hurts a query s performance. This lesson covers the types of index fragmentation your indexes could suffer from, how to identify index fragmentation, and which statements you should issue to correct different types of index fragmentation.

Figure 8-4 Table 8-4

Description Set this to any valid SQL statement or the name of any valid stored procedure. The CommandType value determines the manner of execution (see the following).

The correct answer is a. The -i command changes the default function of Ldifde from exporting to importing.

Lessons in this chapter:

The main reason to install more than one instance of SQL Server 2005 on a single machine is to provide security isolation for each separate instance. After you decide to install multiple instances, you must plan for this configuration accordingly.

7. Create the Customer table with a primary key, enforcing no duplicate cus tomer names, enforcing a credit line between 0 and 50,000, defaulting the

For more information about recovering hard-deleted items from the dumpster using Outlook 2003, search Exchange Server 2007 Help for How to Recover a Deleted Item or access http:// technet.microsoft.com/en-us/library/aa997155.aspx.

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.

1. 2. 3.

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The Windows Shell adds items to the Recent and Frequent lists for your application when one of the following actions occurs: The item is used to launch your application directly for example, when you double-click a file or a shortcut in Windows Explorer. The item is selected by a user in a common file dialog (Open or Save). The item is passed as a parameter to the SHAddToRecentDocs function, which is part of the Windows Shell API.

{ // Load the configuration file. RemotingConfiguration.Configure( "RemoteClientTcpCS.exe.config", false); // Create an instance of the remote Patient class. Patient newPatient = new Patient(); // Call the PersonalInformation method on the remote object.

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DHCP allows you to automatically assign IP addresses, subnet masks, and other configuration information to client computers on the local network. When a DHCP server is available, computers that are configured to obtain an IP address automatically request and receive their IP configuration from that DHCP server upon booting. When a DHCP server is unavailable, such clients automatically adopt an alternate configura tion or an Automatic Private IP Addressing (APIPA) address. Implementing a basic DHCP server requires installing the server; authorizing the server; configuring scopes, exclusions, reservations, and options; activating the scopes; and finally, verifying the configuration.

create volume simple size=500 disk=2 select volume 4 assign letter j select volume 4 extend size=250 disk=2

The Server parameter specifies the server from which you want to obtain mailbox statistics. If you do not specify this parameter, the command returns statistics for mailboxes on the server on which Exchange Management Shell or the PowerShell console is running. You can use one of the following values:

For scenarios in which the data sources have high concurrency and large datasets, these actions could generate the following issues:

In the existing query window, type, highlight, and execute the following SQL statements to modify the primary key constraint on the Test.SalesOrderDetail table to become a nonclustered index and then create an appropriate clustered index for the query: