Report model - number of values selected in DDL param

Question

Good afternoon,
I have created a report model that references Teradata views, and I am using this model to populate several datasets in a Report Builder report.  One dataset returns actual results, and the other datasets are used to populate available values for multivalued
parameters.
The issue I'm encountering is that some of my parameters return a large number (tens or hundreds of thousands) of selectable values.  When clicking "select all", I'm getting an error, since the concatenated list of values exceeds
the length limit.  However, since I'm working with a report model, I cannot use T-SQL workarounds such as custom "<ALL>" values/handling.  I also need to limit my result set using these values as parameters, not filters, since I want
the intensive processing handled in the DB server, not the app server.
Is there any possible way to accommodate this?  As an example, I have a large (200k+) list of products, belonging to about 7,000 brands.  I want both my product number and brand lists as multivalue parameters...I might want to run
the report for all products and all brands (returning 200k+ rows), or choose "select all" in the products list, but only pick a few brands (or vice versa).  Cascading parameters (with the first parameter limiting the next set of values)
is not an option since there are many of these parameters that have too many values for the allowed limit (i.e. even my brand list generated the error when I choose "select all" and only picked a few products).
I have searched literally dozens of forums and tech sites, all to no avail thus far.  Any assistance will be greatly appreciated...thank you!
-Chris

Answer 1

I have a SSRS Report with 4 multi-select parameters.
The customer has requested that they would like the drill-through to open in a new window.
I am using Java Script for that purpose.
However, there is a limit on how long a URL may be.
Is there a way in a SSRS report to limit the number of values in a multi-select parameter selected?
Thanks.
One workaround is to add a internal parameter which will count the number of selected values and will allow the navigation only if the count falls below the threshold.
For this you can use an expression like below for setting the internal parameter
Len(Join(Parameters!MultiValuedParameter.Value,","))-Replace(Join(Parameters!MultiValuedParameter.Value,","),",","")
Then use expression like below for the jump to url/report property
IIf(Val(Parameters!HiddenParameter.Value)<=<your thresholdvalue>,<report url>,Nothing)
You can also add a notification textbox on top which will show a message like "Report navigation not possible due to too many values selected" and keep it hidden by default. Then based on above parameter value you can make it visible
ie make hidden property like below
IIf(Val(Parameters!HiddenParameter.Value)<=<your thresholdvalue>,False,True)
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