Maximum number of Rules in a DMN

[sjamesworld]

Hello Team,

We’re currently in the process of evaluating Camunda 8, trying to understand whether there is any limitation on number of rules defined in a DMN.

For our use case it might be more than 2000 rules, if we want to define more rules what are the considerations that should be taken into account?

Thanks,
Priya

[nathan.loding]

Hi @sjamesworld - if you search the forums, there are several topics around this same question (for instance, here and here). Generally speaking, there is no maximum, but you will start to run into performance issues the more rules you add.

It’s important to remember that DMN is meant to be maintainable by humans, and a table with that many rules may be hard to maintain. Could you separate it into smaller tables and chain them together perhaps? I would also recommend reading through those previous threads and searching the forum for other topics and experimenting with the suggestions there.

[Webcyberrob]

Hi,

This past thread may also be of interest…

DMN Performance Benchmark Result

Hi all, I recently submitted a solution to the Decision Management Community Benchmark Challenge. The benchmark comprises a single, large decision table of 16,369 rules for various combinations of medical service characteristics used in the Condition columns. There are 7 input columns and 3 output columns. My solution comprised the Camunda DMN engine embedded in an AWS Lambda function with no special tuning, just using out of the box configuration. For those interested in DMN performance, the …

Regards
Rob