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RAID 0 does not provide any fault tolerance, but it does provide good performance. RAID 1 provides full fault tolerance by maintaining a duplicate copy of all data. RAID 5 can withstand a single drive failure. A mirror of stripes configuration provides fault tolerance equivalent to RAID 5 with improved performance, whereas a stripe of mirrors provides maximum fault tolerance along with maximum performance. SANs can be configured as a file system, full disk, or combination of both. You can use the tempdb database for many operations that are not immediately visible, such as online index creation and online index rebuilds. Although tempdb is a temporary storage space, SQL Server cannot function with out it. To achieve maximum performance when tempdb is heavily used, you should consider moving tempdb to a dedicated set of drives as well as potentially adding additional files. Filegroups can be used to group database objects having similar usage patterns. Because filegroups can be restored while the database remains online, careful planning of the location of objects can significantly improve availability of a database.

In the dialog box shown in Figure 6-1, you can choose the software and settings that you want Windows Defender real-time protection to monitor. However, Microsoft recommends that you use all of the real-time protection options, called agents. For this reason, the practice session later in this lesson does not ask you to reconfigure real-time options. Table 6-2 lists these agents and states the purpose of each.

Programmers use the SQL common language runtime (CLR) integration feature to generate .NET assemblies. The feature is disabled by default, and you must enable it through the sp_configure stored procedure to use objects that are implemented using CLR integration.

-- Drop the table used in this example. DROP TABLE Test.CoveredIndexTest;

Introduction to IPv4 Addressing IPv4 controls packet sorting and delivery. Each incoming or outgoing IPv4 packet, or datagram, includes the source IPv4 address of the sender and the destination IPv4 address of the recipient. IPv4 is responsible for routing. If information is being passed to another device within a subnet, the packet is sent to the appropriate internal IPv4 address. If the packet is sent to a destination that is not on the local subnet (for example, when you are accessing the Internet), IPv4 examines the destination address, compares it to a route table, and decides what action to take. You can view the IPv4 configuration on a computer by opening the Command Prompt window. You can access this either by selecting Accessories and then Command Prompt on the All Programs menu, or by entering cmd in the Run box. If you need to change a configuration rather than to merely examine it, you need to open an elevated command prompt. The Ipconfig command-line tool displays a computer's IPv4 settings (and IPv6 settings). Figure 6-1 shows the output of the Ipconfig command on a computer connected wirelessly through a WAP to the Internet and internally to a private wired network that is Configured through APIPA. For more detail enter ipconfig /all.

Ian McLean If a user you support does not want to update his or her software or spyware definitions automatically, possibly because that user connects to the Internet only intermittently through a dial-up connection, you should recommend frequent update checks (at least once per week). This can be a difficult situation, particularly if the user does not have administrator privileges and you need to supply administrator credentials every time an update is needed. When you are dealing with inexperienced or unsophisticated users, this is much less a technical problem than a people problem. Such users are often nervous about things happening on their computer while they are asleep. They are typically unsure about allowing their workstations to be updated automatically when they are not using them. They are particularly worried if, when they start working with their computer in the morning, they are told it requires a reboot (although this happens less often with Windows Vista than with other OSs). If they have left work unsaved on the computer overnight, this can compound the problem. As a support technician and an administrator, you need people skills as well as technical skills. You need to convince users that they should let operations such as updates happen automatically and tactfully warn them of the consequences of a malware infection on their computer. Automatic updates at nonpeak times make life easier for the users you support and for you. As far as persuading your users to back up their work regularly and especially before they leave their machines last thing in the afternoon or evening is concerned any administrator will tell you that s the hardest job of all!

MessageBox.Show("Data saved As Northwind.xml")