For performance reasons and due to data complexity you should not poll the CAS DC directly. Instaed use the REST API to get the information you require. https://community.dynatrace.com/community/display/...
I agree with Alasdair, structure of DC RUM SQL database is pretty complex. See my comment at https://answers.dynatrace.com/questions/151700/is-it-possible-to-integrate-dcrum-with-a-net-appli.html?childToView=151793#answer-151793 - I would recommend using dedicated integration API we delivered in 12.4