Managing Content in VS .NET

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Managing Content
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When a report is configured to use the default execution properties, Reporting Services processes a report on demand each time a user requests the same report, which results in a new query for each request. The overhead of all these queries might have negative performance consequences on the source database as well as the Report Server, so you must weigh this against the benefits of providing users with access to the up-to-date data. To improve the experience of report viewing and navigation with Report Manager, Reporting Services uses session management. A session begins when a user opens a report for viewing in a browser or client application. After the intermediate format of the report is created, a copy is placed in the session cache, which is maintained in the SQL Server database ReportServerTempDB. The session ends when the user closes the browser or client application. If a report s definition changes while a user is viewing it in an active session, the user will not see the updated version of the report until the user manually refreshes the report, which retrieves the current version from the ReportServer database. In this procedure, you ll execute a report on demand and respond to prompted credentials. Execute a report on demand with prompted credentials 1. In Report Manager, click the Home link, click the My Adventure Works folder link, and then click the Order Details report link to see this report:
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The Reseller report parameter in this report is dependent on a query that uses the rs2005sbs data source that you converted to prompted credentials earlier in this chapter. Even though a default value has been defined for this report parameter, the query
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Part III:
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must execute to build the list of available values for Reseller. Accordingly, the user must enter a login name and a password. 2. Enter ReportExecution as the login name and ReportExecution as the password. 3. Click View Report to confirm that the top of your screen looks like this:
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The query for the Reseller report parameter executes, and because the report parameter includes a default value, the report query also executes. Now the report is visible and you can change any report parameter value to update the report. The credentials are retained in the report for use in the next query, which is triggered when you click View Report. Note Technically, the report is not executed on demand each time you view it. The report is stored in the session (in ReportServerTempDB) and subsequent refreshes of the page in the same session retrieve the same report. In effect, the session is a private cache of the report. To force the report to retrieve new data, you must click Refresh on the Report Manager toolbar.
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9:
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Implementing Cached Instances
A cached instance of a report is like a session report, except that the same intermediate report can be shared between multiple users. Using a cached instance of a report reduces the number of queries to the source database and potentially improves the performance of report execution. In this case, Reporting Services starts the process with the intermediate format of the report, which is stored temporarily in the ReportServerTempDB database. This intermediate report is flagged as a cached instance and is used for rendering in response to subsequent requests for the same report until the cached instance expires. If a report uses query parameters, the query parameters are applied when the cached instance is created. This means that if the user selects a different parameter value that changes the value of a query parameter, a new cached instance is placed in the ReportServerTempDB database, but only if a cached instance with that parameter value doesn t already exist. Consequently, it s possible to have a cached instance for every combination of parameter values in a report. Whereas a change in a query parameter triggers a new cached instance, a filter based on a report parameter value is applied each time to the existing cached instance. In this case, each change in a filter value renders the report again without the advantage of storing the results as a cached instance. When you change a report s execution properties to use a cached instance, you limit the amount of time that it persists in the ReportServerTempDB database by establishing an expiration rule for caching. You can expire a cached instance at regular intervals or according to a report-specific schedule or shared schedule. Regardless of how you choose to expire a cached instance, the report must use a data source that draws on stored credentials. In this procedure, you ll configure a report as a cached instance that expires on a reportspecific schedule. Configure a cached instance 1. In Report Manager, click the Home link, click the Adventure Works Bikes folder link, and then click the Bike Sales and Profitability report link. 2. Click the Properties tab, and then click the Execution link.
Part III:
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