Yesterday I published a new blog post on our company blog: http://blog.paralleluniverse.co/post/44146699200/spaceships
It showcases a 10Ks spaceship battle simulation we've built on top of our spatial DB, which was built in Java. The point of the post is not to show how fast the simulation can run because there are faster ways to do it. The idea is to show how even a naive solution running on top of the right kind of database can achieve decent performance and good scaling.
I think some of you may find this interesting.