Kdb+ is superior to MongoDB in data analytics
If you are looking for a database with far superior scalability and analytic capability, one only needs to look at what Wall Street uses for high frequency equity trading. This market has the most severe requirements for database performance where a milisecond is worth millions. Companies in search of performance should take their queues from them.
kx, headquatered in Palo Alto, CA supplies the kdb+ platform to the majority of global trading houses and holds a dominant position in this space. kdb+ is clearly the world's top data management platform. Although its 64 bit platform provides its highest performance, kx has just made its 32 bit version of the platform free for commercial purposes.
Developers looking to be at the cutting edge would be well advised to pursue this free option.