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A number of factors affect the efficiency of database access. Here are some ways for improving database access to consider for your applications: Use stored procedures. The first (and perhaps most obvious) consideration is the way you write your queries. In the Friends Reunion application, you have used SQL text queries throughout. You ve done this for one reason only: to simplify the code. You can
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CHAPTER 12 CACHING AND PERFORMANCE TUNING
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give your application an instant performance boost by converting that code into stored procedures. Stored procedures are precompiled and highly optimized, and reside within the database. That means you don t need to transmit and compile the entire query each time you use it. As a result, you benefit from reduced traffic between your web server and the database server, and a significant reduction in the database server workload (especially for complex queries). Code the DataAdapter component manually. The automatically generated commands that a DataAdapter component can produce are not optimized, and not as powerful as coding your own commands. Choose a managed provider carefully. Use a data provider that is specifically written for the database engine you re targeting, instead of a generic one. If you re targeting Microsoft SQL Server, you should use the classes found in the System.Data.SqlClient namespace, rather than the more generic classes found in the System.Data.Odbc namespace. This will avoid an extra level of indirection and, better yet, your code will be speaking SQL native language, and thus dramatically improve performance. Use DataReaders instead of DataSets. What about the relative costs of DataReader and DataSet objects You should use a DataReader in preference to a DataSet wherever possible. Remember that the disconnected nature of a DataSet is achieved by storing all the data in memory, so if you don t need to cache the data, you should be using a DataReader instead. Set up connection pooling correctly. Remember that the useful connection pooling offered by ASP .NET (which manages open connections and allows them to be reused, thus avoiding some of the overhead of connection opening and closing) will work only if you use identical connection strings for identical datastores. If you have two connection strings that differ by even a single character, the connection-pooling mechanism will consider them as different.
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Performance is a feature of your application, which you should consider even before starting to write your very first line of code. As it happens, in this chapter, you ve considered and applied some retrospective changes to the Friends Reunion application: Caching expensive pages, page fragments, and data objects Disabling viewstate where appropriate Replacing Response.Redirect() with Server.Transfer() Replacing web controls with HTML elements where possible Disabling session state where possible You managed to apply all these changes without too much effort, but it would have been a lot easier if you had applied some of the practices here at the time you wrote the application. Certainly, at the time you design an application, it s often possible to pick out places where
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CHAPTER 12 CACHING AND PERFORMANCE TUNING
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you have things like large, frequently generated datasets. In those cases, you should plan your cache usage as part of the application design, establish the expiration of the cached object, and convince yourself that there will be enough cache memory to contain it. The main cache area we ve examined in this chapter is the ASP .NET cache. This is an area of memory on the web server that is provided by ASP .NET for output caching and for data caching. You ve also seen that some items can also be cached further downstream, in areas of cache at the proxy server or in the browser itself. Caching is undoubtedly one of the most powerful techniques available for improving web application performance. New ASP .NET caching features, such as the ability to cache the whole or a fragment of a page, are very well suited to their task. It s clear that you don t need to resort to tricky code. You can write clean and maintainable code that uses the different features you have learned about in this chapter to effectively improve your application s performance. Our intention has been to demonstrate how to test your application and to suggest some of the options ASP .NET has on offer. There is much to explore, and we hope we ve given you some ideas! As we noted earlier, there is much more information on these subjects in Performance Tuning and Optimizing ASP .NET Applications, by Jeffrey Hasan and Kenneth Tu (Apress, 2003; ISBN: 1-59059-072-4). Also, see the Microsoft Patterns and Practices site (www.microsoft.com/ practices), particularly the guide Improving .NET Application Performance and Scalability (http://msdn.microsoft.com/library/en-us/dnpag/html/ScaleNet.asp). In the next chapter, we ll turn our attention to the task of preparing the Friends Reunion application for deployment on production servers.
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