I expect there is a persistent store of some sort, you'll have to register to find out. I'm also unable to find a license without registering. It does appear f

I expect there is a persistent store of some sort, you'll have to register to find out. I'm also unable to find a license without registering. It does appear from the FAQ that you build your transactions as Java stored procedures. Constraining a generic SQL database that way will make it much easier to distribute and scale.