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To continue our online store application example, suppose that after running a few early benchmark tests, you determine that the benefits of having a natural key on the product SKU outweigh the performance impact you found let s say, you discovered an 8% performance degradation. However, in these early benchmark tests, you used a test data set of 10,000 products and 100,000 orders. While this might be a realistic set of test data for the first six months into production, it might be significantly less than the size of those tables in a year or two. Your benchmark framework will show you how your application will perform with a larger database size, and in doing so, will help you to be realistic about when your hardware or application design may need to be refactored. Similarly, if you are developing commercial-grade software, it is imperative that you know how your database design will perform under varying database sizes and hardware configurations. Larger customers may often demand to see performance metrics that match closely their projected database size and traffic. Your benchmarking framework will allow you to provide answers to your clients questions.

The first two options in Table 8-6, server_port and server_address, specify the port number and IP address that the daemon will bind to. This defaults to all addresses on the host on TCP port 5667.

Finally, benchmark tests give you the ability to identify potential problems on a broad scale. More than likely, a benchmark test result won t show you what s wrong with that faulty loop you just coded. However, the test can be very useful for determining which general parts of an application or database design are the weakest.

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In addition to all the metadata that .NET relies on to function, you can add your own metadata to any of these items in the metadata hierarchy using attributes. You can place attributes in many places in your code. They are compiled into the assemblies, and sit there waiting until some other code asks to see if they exist. .NET provides a massive number of attributes, which are used to control mechanisms such as serialization, remoting, Web Services, ASP .NET, and the behavior of components. In addition, you can define your own attributes. These are the same as .NET s attributes, and you can create systems that handle code using your custom attributes that are just as sophisticated as .NET s offerings. You can use attributes to provide labels and information about your types that will be visible to other code accessing them reflectively. If you have an automated testing program that checks all your code and meets the functional specification after you run a build, you could use an attribute to label and name a test method to be called on each type. A generic test harness could use this information to locate all the unit tests and execute them, regardless of the precise methods provided on each class. We ll look at attributes in more depth in 11.

For the server_port value, you cannot specify a privileged port (i.e., a port number lower than Tip

For example, let s say you run a set of benchmark tests for the main pages in your toy store application. The results show that of all the pages, the page responsible for displaying the order history has the worst performance; that is, the least number of concurrent requests for the order history page could be performed by the benchmark. This shows you the area of the application that could be a potential problem. The benchmark test results won t show you the specific code blocks of the order history page that take the most resources, but the benchmark points you in the direction of the problem. Without the benchmark test results, you would be forced to wait until the customer service department started receiving complaints about slow application response on the order history page. As you ll see later in this chapter, profiling tools enable you to see which specific blocks of code are problematic in a particular web page or application screen.

In the remoting section of this book in s 2 through 5, we broke down the kinds of tasks you can accomplish with reflection into the following sections.

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