If it's the latter, I'd still go with separate databases because it gives you the ability to have different users on a database level and from version 2.2, concurrency will be on a database level (so there's no sharing of the write lock, for example, that you'd have if you split it out on collection level). How do I respond as Black to 1. e4 e6 2.e5? Deploy fully managed MongoDB across AWS, Google Cloud, and Azure with best-in-class automation and proven practices that guarantee availability, scalability, and compliance with the … Run it on Heroku, it just works™ and it makes me feel like some grizzled, elite Spetsnatz commando has my back. In summary, the DOB concept offers a richer experience with modern programming techniques. Writes still go directly to the master DB and get replicated to the slaves automatically by MongoDB. Ross 2013-06-10 17:44:37.