Sure SQL databases can scale. Oracle for instance has a parallel query option, but it costs real money and needs a lot of planning and configuration. NoSQL dat

Sure SQL databases can scale. Oracle for instance has a parallel query option, but it costs real money and needs a lot of planning and configuration. NoSQL databases scale much easier. Just add a new node and you are done. +1. Many of them are also freeware. +1 again. Many of them are also faster, because no parsing is done, +1. Many of them don't have and don't need locking. +1. No looks mean no write waiting. +1. Decide yourself.