GenieDB http://www.geniedb.com http://www.geniedb.com is an interesting possibility for these kinds of migrations. It allows you to use NoSQL type stores with a

GenieDB http://www.geniedb.com http://www.geniedb.com is an interesting possibility for these kinds of migrations. It allows you to use NoSQL type stores with a MySQL interface, using SQL and even doing JOINs between MySQL and NoSQL tables. The idea is you can gradually adjust your application over time without a sudden transition where you have to rewrite all your database code. (Disclosure: I'm on the advisory board.)