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SQLServer:Locks: Lock Timeouts/sec Shows the number of locks per second that timed out. If the value in this counter is more than zero, users might be experiencing problems with queries that are not completing. SQLServer:Locks: Number of Deadlocks/sec Shows the number of locks per second on the SQL Server that become deadlocks. If the value in this counter is more than zero, users might be experiencing problems with queries that are not completing, and applications might be failing. SQLServer:Memory Manager: Total Server Memory (KB)

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The exact structure of SQL commands varies between database servers. Some data base servers, for example, require each command to be separated by a semicolon. Microsoft SQL Server does not have this requirement, however.

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Network clients are software components, such as Client Service For NetWare and Cli ent For Microsoft Networks, that allow the local computer to connect with a destination network operating system. By default, Client For Microsoft Networks is bound to all local area connections. Client For Microsoft Networks allows Windows client comput ers to perform CIFS-related networking tasks, such as connecting to shared folders. Network services are software components, such as File And Printer Sharing For Microsoft Networks, Network Load Balancing, and QoS Packet Scheduler, that provide additional features for network connections. File And Printer Sharing For Microsoft Networks, which allows the local computer to share folders for network access, is installed and bound to local area connections by default. Network protocols are basic software components such as TCP/IP and AppleTalk that allow a computer to communicate with other computers. Network clients and services are built on top of network protocols. By default, the TCP/IP protocol is bound to all connections.

To view advanced connection settings, open the Network Connections window and select Advanced Settings from the Advanced menu. The Advanced Settings dialog box, shown in Figure 1-8, displays the order (priority) of each connection. By adjusting the order of the connections, you can configure the computer to attempt network communication through various available connections in the order you define. You can also adjust the binding order of the services used for each connection.

Assuming a table named customers existed, and the application had the right to drop the table, the table would be lost. Depending on the application and the database con figuration, such maliciously malformed queries can also be used to retrieve data from the database and run operating system commands.

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Shows t he amount of memory that is allocated to SQL Server. If this memory is equal to the amount of total physical memory on the machine, you could be experiencing contention because the Windows operating system has not been allocated any RAM to perform its normal operations.

Figure 1-8

Provider Order Tab The Provider Order tab of the Advanced Settings dialog box, shown in Figure 1-9, displays the order in which various network providers, such as a NetWare Network, Microsoft Windows Network, or Microsoft Terminal Services, will be attempted. Note that network provider order is not attached to specific connections. If a computer is configured to bind to NetWare before Windows networks, the computer will do so for every connection.

A denial-of-service (DoS) attack prevents legitimate users from accessing a network ser vice. A DoS attack does not give the attacker a higher level of access; instead, it denies legitimate users from accessing the application. Although the most dangerous attacks allow an attacker to gain elevated privilege on the target computer, DoS attacks can be very costly to victims. Generally, the loss of private information is much more devas tating than the damage done by a denial-of-service attack, and as a developer, you should focus more of your energy on preventing potential vulnerabilities that an attacker could exploit to reveal information.

Figure 1-9

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Shows the amount of SQL recompiles per second. If this number is significantly higher than its baseline value, stored procedure execution plans might not be caching appropriately.

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In a default installation, Microsoft Terminal Services is given priority over the Microsoft Windows Network because Microsoft Terminal Services, when used, is intended to be used in place of other connections. Also by default, a connection to a Web Client Network is attempted only when the first two providers fail to respond. The Provider Order tab also displays the order for print providers. According to default settings, LanMan Print Services (the print provider used in typical Windows networks) is given priority over HTTP Print Services.