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Lightweight pooling is an option available in SQL Server 2008 that can potentially help in multiprocessor environments that experience heavy context switching. Lightweight pooling potentially increases throughput, which can increase performance. Enable lightweight pooling by executing the following code: EXEC sys.sp_configure sp_configure 'lightweight pooling', '1' GO RECONFIGURE GO Unfortunately, you cannot enable common language runtime after the enabling of lightlightweight pooling. If you do enable the feature, SQL Server will generate a message to remind

AddMessage("ERROR: " + err.Message); } // Listen for more messages. socket.ReceiveAsync(e); } This completes the messaging client. To experiment with the complete solution, try the downloadable code for this chapter.

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Note You can make a number of refinements to polish the messaging application. You ve already considered how you can replace the simple message-passing mechanism on the server side with more complex logic that recognizes different types of messages and performs various operations. Other changes you may want to implement include managing user-interface state (for example, disabling or enabling controls based on whether a connection is available), intercepting the application shutdown event and politely disconnecting from the server, allowing users to deliver to specific people, adding identify authentication, and informing newly connected clients about how many other people are currently online. With all that in mind, the messaging application is still an impressive first start that shows how far a Silverlight application can go with direct network communication.

Caution We have experienced problems with our linked server queries failing after our having enabled lightweight pooling. Our particular problems became apparent upon restart of our services. If you are working in an environment with linked servers, then make sure you test thoroughly before enabling lightweight pooling.

Go to the SharePoint site and select the Requirements list. This list will be empty and will only include the Title column.

As you ve seen, Silverlight gives you considerable power to communicate with sockets, but the cost is complexity. Interestingly, Silverlight has another communication mechanism that s far simpler: the local connection model. Whereas socket support allows a Silverlight application to communicate with virtually any networked program, on any computer (provided there s no firewall blocking the way), the local connection feature is far more modest. It provides a simple way for two Silverlight applications running on the same computer to interact. This feature is particularly suited to out-of-browser applications, because users are more likely to run them in combination and leave them loaded for long periods of time. In the following sections, you ll take a quick look at the local connection model, and see how it allows you to build the application shown in Figure 20-10.

Have you ever identified resource-intensive queries on your system that cause all sorts of performance problems We especially get annoyed with users who execute queries and forget the where clause and the nolock hint on the largest table in our Very Large Databases (VLDB). To avoid such problems, you can specify a maximum limit in seconds for queries executed against your server. Such a limit is termed a query governor cost limit. Before you can specify a limit in seconds, you must enable the option as follows:

Figure 20-10. Sending messages between local applications The local connection model works through two classes in the System.Windows.Messaging namespace: LocalMessageSender and LocalMessageReceiver. Together, these two classes allow one way communication. The sender application transmits a message to the receiver. If you want both applications to have the chance to send and receive messages, you simply need to use the LocalMessageSender and LocalMessageReceiver in combination. It s also worth noting that communication doesn t need to be one-to-one. The message that one application sends can be received by any number of other Silverlight applications that are running at the same time. Or, it can be received by none. Unlike sockets, local connection messaging is a one-way, fire-and-forget system. The message sender has no idea whether its message has been received, unless the responder sends a confirmation message back.

Just like with the Functional Areas list, you will need to add the desired columns to the view. From the List ribbon, click the Modify View button. Select the columns that you want displayed and specify the order they should appear on the page. The completed section should look like Figure 2-21.

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