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For Windows authentication to work, the currently logged-on Windows user must have the required authorization to access the SQL database. This isn t a problem while you test your websites, because Visual Studio launches your web applications using your user account. However, when you deploy your application to a web server running IIS, you might run into trouble. In this situation, all ASP.NET code is run by a more limited user account that might not have the rights to access the database. Although the exact user depends on your version of IIS (see the discussion in 26), the best approach is usually to grant access to the IIS_IUSRS group.

Once you are communicating with your server via certificate authentication, a script like the one shown in Listing 21-4 can bind PHP to the presented certificate. In this case, you will access the Common Name field from the SSL certificate. This data can be trusted because Apache has already verified the certificate with your CA certificate. Listing 21-4. PHP and SSL Interaction < php //The user's name is stored in the certificate's Common Name field. echo "Hello, ". $_SERVER['SSL_CLIENT_S_DN_CN'];

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Every database server stores a master list of all the databases that you ve installed on it. This list includes the name of each database and the location of the files that hold the data. When you create a database (for example, by running a script or using a management tool), the information about that database is added to the master list. When you connect to the database, you specify the database name using the Initial Catalog value in the connection string.

the video tutorials at http://msdn.microsoft.com/vstudio/express/sql/learning. There, you ll find over nine hours of instruction that describes how to use the free SQL Server 2005 Express Edition with Visual Studio. The tutorials move from absolute basics covering topics such as database data types and table relationships to more advanced subject matter such as full-text search, reporting services, and network security.

Note If you haven t made any changes to your database configuration, SQL Server will quietly tuck the files for

Accessing a database in a web application is a completely different scenario than accessing a database in a typical client-server desktop application. Most developers hone their database skills in the desktop world and run into serious problems when they try to apply what they have learned with stand-alone applications in the world of the Web. Quite simply, web applications raise two new considerations: problems of scale and problems of state. Problems of scale are the problems that can result from the massively multiuser nature of the Web. A web application has the potential to be used by hundreds or thousands of simultaneous users. This means it can t be casual about using server memory or limited resources such as database connections. If you design an application that acquires a database connection and holds it for even a few extra seconds, other users may notice a definite slowdown. And if you don t carefully consider database concurrency issues (in other words, what happens when the changes from different users overlap), you can run into significant headaches, such as failed updates and inconsistent data.

newly created databases into a directory like c:\Program Files\Microsoft SQL Server\MSSQL.10.MSSQLSERVER\ MSSQL\Data (although the exact path depends on the version of SQL Server you re using). Each database has at least two files an .mdf file with the actual data and an .ldf file that stores the database log. Of course, database professionals have a variety of techniques and tricks for managing database storage, and can easily store databases in different locations, create multiple data files, and so on. The important detail to realize is that ordinarily your database files are stored by your database server, and they aren t a part of your web application directory.

Note Problems of scale can occur when developing traditional client-server desktop applications. The

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