14. Is there any other DB option besides Redis DB?

No. GMiD™Box works only with Redis DB. There is no other database which can give such performance for free. Redis DB is the fastest In-Memory database which supports clustering and data sharding with replication and fail over mechanisms. And it is not hard for operations and maintenance. It is a simple Key-Value database, not relation database, and its performance is incredible. In our labs we did tests with 6millions transactions per second. It is really amazing and by using GMiD™Box it will be a good starting point for you to see the real power of Redis DB and probably to use it on some other projects.