I'm not sure how helpful this will be, but some other questions I thought about before my viva (which was in literature, so not a DBA, but some of these general points will be relevant to all doctorates I would have thought):
- If you were to restart this project from the beginning, what would you do differently?
- How would you take your research forward (publications, future projects, applying it to business situations, etc.)?
- Since you talk about 'holes', it might be worth having some idea of what you might say should the examiners bring them up. How could they be resolved?
And try to have at least some time to relax. I found my viva to be a shockingly enjoyable experience - it's not often you get eminent academics in your field to chat to you about your research ;)
Best of luck!