MDM in a landscape with extreme master data volume & volatility

I'm interested in any statistics relating to the performance of MDM in landscapes where tens of millions of master data records are managed, and have very high volatility (i.e. >10k master data changes per day).

I've read most of the collateral available and can't see any clear guidelines or warnings. Obviously, infrastructure plays a major part in performance, but I'd be very interested in any examples or studies.

Thanks, <i><b>Andy</b></i>