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In general, all caching techniques result in outdated data. As a developer and administrator, you have to carefully evaluate how much staleness is acceptable. As we mentioned, the default report session duration is 10 minutes. If the Report Server decides to use the report session, it will serve the report from the cached copy within the report session duration. But is 10 minutes acceptable If you configure the session duration to expire too soon, you will lose the performance benefits of caching. If the report is cached for too long, data can get stale.
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Sometimes, you may want to force the Report Server to abandon the report session and execute the report anew. As a developer, you can do this in a couple of ways, depending on how the report is requested. If the report s consumer requests the report by URL, you can send the rs:ClearSessionID command to the Report Server, as we discuss in chapter 10. If the report is requested by SOAP, you can programmatically abandon the session by clearing the SessionId property of the SessionHeaderValue proxy class. If the report s consumer doesn t support cookies, the session ID can be explicitly specified in the request URL or as an argument to the Render method call, as we also discuss in chapter 10. From the end-user perspective, if the report includes the standard toolbar, the end user can click the Refresh Report button (or press Ctrl-F5) to clear the session.
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Report execution caching Optionally, you can turn on report execution caching using the report execution page. To access this page, click the Execution link (see figure 8.8). Report execution caching is another big area of confusion. It is important to note that when report execution caching is enabled, the report s IF is not cached in memory. Just like report sessions, report execution caching uses the report s IF cached in the ReportServerTempDB database. So what s the difference While report session caching is correlated with the client, report execution caching is global. In other words, with the latter form of caching, several client applications (or users, for that matter) may access the same cached instance of a given report, as shown in figure 8.11.
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Figure 8.11 With report execution caching, one cached IF instance can be used by more than one client.
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How is report execution caching implemented As we ve just seen, with report session caching, when different clients request the same report the Report Server executes the report for each client and caches as many instances of the report s IF in the ChunkData table as the number of clients. If report execution caching is on, only one instance of the report s IF is cached in the ChunkData table. All subsequent requests will use that instance. Therefore, while report sessions guarantee data consistency within the duration of the report session, the main goal of report execution caching is better performance. If the report doesn t have parameters, only one instance of the report is cached. Otherwise, several instances of the report are cached, a separate instance for each set of parameters. The following conditions have to be met to enable report execution caching: The report cannot use Windows authentication in expressions or to connect to the database. For example, you cannot use User.UserID in your expressions, nor can you use Windows authentication to log in to the database by impersonating the user (the Windows NT Integrated Security option on the data source properties). However, if the data source connection uses Windows Authentication MANAGING RS WITH THE REPORT MANAGER 279
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with stored credentials (the Use As Windows Credentials When Connecting to the Data Source option), then the report can be cached in the execution cache. The report doesn t prompt the user for database login credentials. Let s see an example that demonstrates the effect that this form of caching has on the report s execution. Suppose that the AWC management has requested a report that shows the territory sales by quarter. The Territory Sales by Quarter report meets this requirement (figure 8.12).
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Figure 8.12 Once report execution caching is enabled, it doesn t get processed by the Report Server when requested with the same parameters.
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The report accepts a parameter so that the user can filter the report data by quarter. For simplicity s sake, we restricted the available parameter values to the 2003 quarters only, with Q1 as the default quarter. To demonstrate how execution caching affects the report s execution, the report shows the report s execution time below the title. If the report is not cached, each time you request the report the execution time changes, which means that the Report Server does indeed process the report. Because it is likely that data for past quarters will be relatively static, let s change the execution options to cache the report in the execution cache for 10 minutes by using the Execution link in the Report Manager, as shown in figure 8.13. Now, request the report several times for the same quarter. Notice that the execution time doesn t change, which means the report is effectively cached.
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