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case of SQL Server, behind the scenes this option executes the SETUSER system function to impersonate the database connection, so it runs under the identity of the Windows account of the user requesting the report. For example, imagine that you log into Windows as AWDomain\Bob. The report administrator has chosen the Credentials Stored Securely option and has entered User Name and Password credentials of an account that belongs to the sysadmin SQL Server role. Now, you request the Sales by Territory report. The Report Server calls SETUSER AWDomain\bob. From a database point of view, this is exactly the same as if Integrated Authentication were used. Windows Integrated Security Next, we have the Windows Integrated Security option. When you use this option, the Report Server will attempt to establish the connection under the context of the Windows account of the user requesting the report. If you are a .NET developer, this is the exactly the same as if you d specified the Integrated Security=SSPI setting in the connection string. The important thing to remember here is that the Report Server impersonates the call to the database to run under the context of the report user. For example, in the previous scenario where Bob is requesting a report, the call to the database goes under the AWDomain\Bob account. Of course, in order for this to work, the database administrator has to create a database login for this Windows account and grant the right privileges. Using the Windows identity for database authentication is convenient because it allows the database administrator to simplify the database security model by using existing Windows accounts. However, for performance reasons, we don t recommend you use this option for large reporting applications. Because the connection string for each user will be different (Windows account names and passwords are different), the connections will not be pooled. Actually, to be more accurate, you will end up with as many connection pools as the number of users requesting the report. Not good! This also could open up a security issue in that someone could publish a rogue report with integrated security and trick an administrator into running the report. Credentials Are Not Required Finally, the Credentials Are Not Required option allows you to configure a data source connection to use no credentials. This could be useful in the following circumstances: The data source doesn t support authentication For example, in chapter 15 we create a custom dataset extension to report off ADO.NET datasets. Because in this case we won t have a database to connect to, we can use the Credentials Are Not Required option.
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The credentials are specified in the connection string As we mentioned at the beginning of this section, you can store the credentials in the connection string by manually changing the data source definition. The report is a subreport that use the credentials of the parent report to connect to its data source In this case the subreport will inherit the data source credentials from the parent and there is no reason to set up specific credentials. When you select the Credentials Are Not Required option, the Report Server uses a special account to make the connection. For more information on how to set up this account, refer to the Configuring an Account for Unattended Report Processing section in the product documentation. Monitoring database connection pooling If you have experience in writing Microsoft-centric, data-driven applications, you have probably heard about database connection pooling. Database connections are expensive resources. Many database providers, such as the .NET SqlClient provider, perform connection pooling behind the scenes to minimize the number of open database connections. When a connection is closed, it is returned to the pool. When the application needs to connect to the database again, the provider checks the pool for available connections. If it finds one, it uses that connection; otherwise, it creates a new one. So, connection pooling makes your application (in our case, the Report Server) more scalable. The catch is that two connections can share the same pool only if their connection strings are exactly the same, including the login credentials. The Credentials Stored Securely in the Report Server option enforces this rule and enables connection pooling. Therefore, this is our preferred option for better performance results. To see how each authentication option affects the number of open database connections, open the Performance console from the Administrative Tools program group, as shown in figure 3.8. Let s first experiment with the Credentials Stored Securely in the Report Server option. Before we start, you may want to change the Report Server session timeout from its default value of 600 to the minimum allowed value of 60 (the SessionTimeout column in the ConfigurationInfo table in the ReportServer SQL Server database). This causes the report session to expire sooner, which in turn forces the Report Server to query the database when processing the report.
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