Google Cloud SQL (MySQL)
developers.google.com
developers.google.com
This SQL service is so limited I have no clear idea what it's even useful for. Google is destroying their brand with these mediocre services. What happened to their standard of not working on projects unless that are at least 2x better than existing alternatives? That standard clearly has gone out the window with the return of Larry Page as CEO. Good luck guys. Must feel pretty bad to be out-geeked by a company that just a few years ago was basically an online bookstore.
How difficult would it be to migrate?
I suppose you could also use it to store key relationships (only), and then periodically update the nosql relationships through the map reduce API also, or build prototypes with it then migrate to nosql when or if you ever need to