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EXEC sp_dbmmonitoraddmonitoring 10 sp_dbmmonitorchangemonitoring: You can use this stored procedure to update the interval in which an existing Database Mirroring Monitor Job will run. There are actually two parameters you will need to pass to this stored procedure. The first is called parameter, and the second is called value. The only value you can use for the parameter argument is 1, which means update period, followed by the new update interval for the value argument. The way Microsoft configured this stored procedure tells us that they plan to implement additional functionality in a future release. Valid values for the update interval are between 1 and 120. You can run the following code to change the Database Mirroring Monitor Job to run every 15 minutes. EXEC sp_dbmmonitorchangemonitoring 1, 15 sp_dbmmonitordropmonitoring: You can use this stored procedure to drop the Database Mirroring Monitor Job. This stored procedure does not accept any parameters. To drop the Database Mirroring Monitor Job, you execute the stored procedure as follows. EXEC sp_dbmmonitordropmonitoring

uring the past decade, a lot of research has been done in the field of distributed computing. Microsoft and other leading vendors have come up with various distributed technologies. Each of the technologies reduces the convolution of building rich applications and lowers development costs. The latest from Microsoft is Windows Communication Foundation (WCF), the next-generation uniform way of developing distributed applications by providing a serviceoriented programming model. WCF (formerly known as Indigo) handles the communication infrastructure of Windows Vista and has been extended to Windows XP and Windows 2003 through the .NET Framework 3.0 (formerly known as WinFX). The .NET Framework 3.0 is a managed programming model for Windows (Windows XP Windows 2003, and Windows Vista) that is designed to replace the , Win32 application programming interface (API) in future releases. WCF provides the communication infrastructure that allows you to create diverse ranges of applications through its simplified model. Based on the notion of services, WCF contains the best features of today s distributed technology stack to develop the connected systems. After completing this chapter, you will have the following knowledge: You ll know about existing distributed technologies and their pitfalls. You ll know about the key architectural concepts that underpin WCF. You ll have seen a high-level overview of WCF s features. You ll understand how WCF unifies existing distributed technologies.

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Let s look at the simplest possible example of a table view to get a feel for how it works. In this example, we re just going to display a list of text values. Create a new project in Xcode. For this chapter, we re going back to the view-based application template, so select that one, and call your project Simple Table.

Expand the Resources folder and the Classes folder. This is such a simple application that we re not even going to need any outlets or actions, so double-click Simple_TableView Controller.xib to open the file in Interface Builder. The View window should already be open, so just look in the library for a Table View (see Figure 8-5) and drag that over to the View window. The table view should automatically size itself to the height and width of the view (see Figure 8-6). This is exactly what we want. Table views are designed to take up the entire width of the screen and as much of the height as isn t taken up by your application s navigation bars, tool bars, or tab bars. After dropping the table view onto the View window, it should still be selected. If it s not, single-click it to select it, and press 2 to bring up the connections inspector. You ll notice that the first two available connections for the table view are the same as the first two for the picker view: dataSource and delegate. Drag from the circle next to each of those connections over to the File s Owner icon. By doing this, we are making our controller class both the datasource and delegate for this table. After doing that, save, close, and go back to Xcode.

Microsoft started its remote invocation technologies with Distributed Component Object Model (DCOM), which extended Component Object Model (COM). Then, .NET introduced technologies such as .NET Remoting and XML web services. We ll now cover these technologies in bit more detail.

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