Handling Large Data Sets in ASP.NET and Crystal Reports

I receive a lot of feedback from my ASP Alliance articles, usually comments.  I don’t typically answer via e-mail, since that doesn’t help the community.  Today I received the following message, and felt it was blog worthy.

Referring URL: http://aspalliance.com/532
Dear Rechard,

I have always been using Datasets and they have given me consistent Results. In fact, I DO NOT USE Report Viewer but export CR Report to a PDF File and then give it to the user as a URL.

BUT, WHEN DATA IS VERY LARGE, THE DATASETS GIVE PROBLEMS such as out of Memory, server not available, Timeouts, hanging etc. I have asked this question to many forums as to how to handle large data sets in ASP.Net with CR.Net. But, nobody has given me any satisfying answer.

I really want to know as to how to solve this problem.

Will You please Help Me.

With Warm Regards,


Here’s the problem–the amount of memory which can be utilized by an ASP.NET web app is 2GB (3GB if you use the /3GB switch).  If your dataset exceeds 2GB on a Windows 2003 Server, you will get a Server Not Available error.  Less than but close to 2GB will cause a significant decrease in performance or warnings about memory.

The answer is simple–you need a smaller dataset!  A 2GB dataset is far too large, especially when you’re feeding it into Crystal Reports.  It sounds like you are dumping every bit of raw data into the report, and having the report process and present the data.  You really need to have your database queries doing more of the filtering and processing, then return a significantly smaller dataset.  In a web environment, it’s best if you only do presentation in your reports–leave the calculations and filtering to the database.

One thought on “Handling Large Data Sets in ASP.NET and Crystal Reports”

  1. Dear Rechard,

    I read your replay in the context of my Query about using Large dataSets.

    I want to tell you that my SPs do all the donkey work of generating bare minimum data, lots of calculations etc. on the Server and send only ready to use data to CR for presentation.

    But, still the problm remains unsolved.

    Off let, I have started using PULL method by using SP as a datasource to CR Report(through OLEDB SQL Server). But, now I am facing a funny problem. I.e. I have also SP as a datasource for Subreport with Parameters and I donot know as to how to pass parameters to a subreport for those parameters which are part of the SP. Again, I have not got any answer for this question.

    May be You can help me. Because, in the absence of filtering parameters(e.g. @P_YEARMM decimal(6,0) etc, I will be unnecessarily calling all the data in CR.

    Please Help.

    With Warm Regards,

    Dilip Nagle

Comments are closed.