SSRS 2008 - ServerReport.SetParameters() suddenly extremely slow

Question

Hi,
We have been using SSRS 2008 R2 for quite a while now but 3 weeks ago we started to notice some performance problems when generating SSRS reports. We have a .NET client which gets the list of reports from the server and then the end user can select a report,
enter the parameter and then view the report in our client.
So 3 weeks ago users started to notice that when they clicked on a report (and in the background we load the parameter prompts etc.) it took almost a full minute. When normally this would only take a few seconds. I have narrowed it down to the method mentioned
in the title. When we call the method ServerReport.SetParameters(parameters) our client has to wait for that one minute.. This also does not go away when you run the report a second time. This is becoming a real problem as our users produce a lot of reports
during the day and every time that method is called the client has to wait 60 seconds. This was not the case 3 weeks ago, I have already checked if something was changed on the server etc. but everything looks okay. Went through the logs etc.
Could it be that our ReportServerTempDB is getting too big? When I checked the logs I saw that the Clean Batch() is running every 10mins so this looks ok. Will check with our Infrastructure Team later to see how big the ReportServerTempDB is and if it is
possible to purge some of the data.
I also read a about report caching but I am unsure if this helps at all and/or which form of caching to use. Our users run a certain amount of reports on a daily basis where only the date range changes (today they run it for 01.08.2014, tomorrow maybe for
02.08.2014 and so on). Would caching help in this case?
Any other things I might be overlooking or that you think could cause the problem?
Thanks a lot!
Fabian

Answer 1

Hi Fabian,
According to your description, the reports performance become poor in the latest three weeks. And you think the issue is caused by the ServerReport.SetParameters Method. As per my understanding, there does not performance concern of SetParameters or other
method among Report Manager, Report Viewer or URL Access. Because every call to Reporting Services will use the same Programmatic interface to render a server report. We can try to directly render the report in report server to check whether it related to
the method.
Besides, I think the problem is duo to the cache of the .NET compilation or the HTML render. We can try to clear the cache and restart the server to check the issue again.
The following similar threads are for your reference:
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/cced1e18-bba0-4d2c-98a1-d245cc2c2b13/reportexecutionservice-vs-reportmanager-performance
http://stackoverflow.com/questions/2274317/c-sharp-winforms-reportviewer-performance-issue-using-refreshreport-and-server
Hope this helps.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support