If you are using the knowledgeAgent (with incremental change-set processing turned on), only the modified rules are re-compiled and added/updated into the kbase.
I have some posts about this in my blog that you might find useful.

Best Regards,

El dic 21, 2010 5:41 a.m., "Wolfgang Laun" <wolfgang.laun@gmail.com> escribió:

Yet another addition:

Changing one DRL file does not mean you have to recompile them all; only the changed one. This means that you can, by judicious distribution of your rules over several .DRL files separate stable rules from the volatile or likely-to-be-changed ones. Then, you keep the KnowledgePackage-s resulting from individual DRL files in serialized form, load those where the DRL does not change into your KnowledgeBase and compile (and save!) the changed DRL.

-W

2010/12/21 Michael Anstis <michael.anstis@gmail.com>

>
> Hi,
>
> Any changes to rules within a DRL will need to be reflected in the KnowledgeBase after ...

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