There is not a list of fields as in automatic credit control there are different factors that will be called during a credit check, and depending on what is ticket will determine what is checked.
In terms of the DCD update for an approved CL Increase. The update to the DCD is not automatic (linked).
You will need to do a check on the DCD in order for it to be released. You could create an event to do this for you - but as standard there will not be an automatic release of the DCD without a "check" against the DCD.
Can you raise the Credit Limit change impact to the DCD in a different thread as you should have one question one thread.