ScaleBase instantly scales out a single MySQL database into multiple instances – with no changes to your application code. Your app continues to “see” one database, but benefits from the power of multiple databases working together.
ScaleBase maintains relational integrity while delivering scalability and flexibility – supporting an unlimited numbers of users and transactions. It is a horizontally scalable database built on MySQL that dynamically optimizes workloads and availability by logically distributing data across public, private and geo-distributed clouds.
ScaleBase software is available free, for start-ups, and on AWS, Rackspace and IBM Clouds. http://www.scalebase.com/