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I have an SSRS report that calls out to a stored procedure. If I run the stored procedure directly from a query window, it will return in under 2 seconds. However, the same query run from an 2005 SSRS report takes up to 5 minutes to complete. This is not just happening on the first run, it happens every time. Additionally, I don't see this same problem in other environments.
Any ideas on why the SSRS report would run so slow in this particular environment?
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If your stored procedure uses linked servers or openquery, they may run quickly by themselves but take a long time to render in SSRS. Some general suggestions: Retrieve the data directly from the server where the data is stored by using a different data source instead of using the linked server to retrieve the data.
If a single report is processing slowly, tune report dataset queries if the report must run on demand. You might also consider using shared datasets that you can cache, caching the report, or running the report as a snapshot.
It's "normal" that SSRS takes more time to load the first time you access it after a long time of inactivity. The issue is caused by the way how SSRS works and SSRS regularly restarts application domain after a specific time period.
SQL Server creates an optimal plan for a stored procedure by using the parameters that are passed the first time to the stored procedure is executed is called Parameter Sniffing.
Thanks for the suggestions provided here. We have found a solution and it did turn out to be related to the parameters. SQL Server was producing a convoluted execution plan when executed from the SSRS report due to 'parameter sniffing'. The workaround was to declare variables inside of the stored procedure and assign the incoming parameters to the variables. Then the query used the variables rather than the parameters. This caused the query to perform consistently whether called from SQL Server Manager or through the SSRS report.
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