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SQL Server 2008 provides a method for members of the sysadmin group to connect to an unresponsive instance of SQL Server, even when other connections are failing. This feature improves the database administrator s ability to troubleshoot problems within SQL Server. By default, in order to utilize a dedicated administrator connection, you must connect on the server itself through SQLCMD or SQL Server Management Studio. Luckily, Microsoft allows you to enable remote dedicated administrator connections, which will allow you to connect to the dedicated administrator connection from across the network. Enable remote dedicated connections for administrators by executing the following code from a query window: EXEC sys.sp_configure 'remote admin connections' ,1 GO RECONFIGURE GO You should now be able to log in as an administrator, not only locally but across the network as well. This ability is invaluable when your server is in trouble and normal logins are not going through.

Note Some of these columns are standard columns shipped with SharePoint. You ll need to find the group that these columns are in. Within each group, the columns are listed in alphabetical order. You can also use the search option provided by the Site Column Picker dialog box. Just start entering the column name in the search box, and the list will show only matching columns.

Note Remember, unless you specify otherwise, the client s port is chosen dynamically from the set of available ports when the connection is created. That means you can have multiple clients open connections to the same server. On the server side, each connection is dealt with uniquely, because each connection has a different client port number.

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By default, SQL Server 2008 enables a server-side trace to start when the SQL Server service starts for an instance. When you start a SQL Server instance, the trace captures some database options, errors and warnings, full-text information, objects creation, deletion and alters, as well as security and memory changes on the server. The trace is light-weight and should not cause performance problems. However, if for some reason you do not want this trace running, then you can disable it by executing the following commands: EXEC sys.sp_configure 'default trace enabled' ,0 GO RECONFIGURE GO Think twice before disabling the trace because it can help you capture events when they occur. How many times have you been asked questions about who performed a certain action or at what time the action occurred If you do not have a trace running at the time the action occurred, you will be unable to provide an adequate answer to such questions. With the default trace, however, such questions may be easily answered.

You ll notice that the code uses a custom method named AddMessage() to add information to the message list. This method takes the extra step of making sure it s running on

The completed column list should look like Figure 2-19.

the user-interface thread. This is important, because AddMessage() may be called during one of the client s asynchronous operations: private void AddMessage(string message) { Dispatcher.BeginInvoke( delegate() { lblMessages.Text += message + "\n"; // Scroll down to the bottom of the list, so the new message is visible. scrollViewer.ScrollToVerticalOffset(scrollViewer.ScrollableHeight); }); } When the client s connection attempt finishes, the OnSocketConnectCompleted() event handler runs. It updates the display and reconfigures the SocketAsyncEventArgs object so it can be used to receive messages, wiring the Completed event to a new event handler. The client then begins listening for messages: private void OnSocketConnectCompleted(object sender, SocketAsyncEventArgs e) { if (!socket.Connected) { AddMessage("Connection failed."); return; } AddMessage("Connected to server."); // Messages can be a maximum of 1024 bytes. byte[] response = new byte[1024]; e.SetBuffer(response, 0, response.Length); e.Completed -= new EventHandler<SocketAsyncEventArgs>(OnSocketConnectCompleted); e.Completed += new EventHandler<SocketAsyncEventArgs>(OnSocketReceive); // Listen for messages. socket.ReceiveAsync(e); } To listen for a message, you must create a buffer that will hold the received data (or at least a single chunk of that data). The messaging client creates a 1024-byte buffer and doesn t attempt to read more than one chunk. It assumes that messages won t be greater than 1024 bytes. To prevent potential errors, the messaging application should enforce this restriction as well. One good safety measure is to set a MaxLength property of the text box where the user enters new messages.

Enabling Use of the CLR (Common Language Runtime)

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