[rgo]

Our enterprise on-premise software package runs on Mongo, before it used to run on relational dbmses. Here's why we changed:

- flexible document schema reduces migration complexity greatly, really important when we have our software deployed on many customers sites. - flexible schema is also important to our product because we support custom forms and fields. - the ability to store and search nested data - replication is easy to setup - easy to maintain, good export formats - no dependence on customer's DBAs - no more frustrating explain-plan debugging of underperformant joins - text search (simple yet useful) - regex support - fast, up to 3x faster than SQL based engines for our use cases. - works well as a cache - decent also as a work queue with tailable capped collections.

Our biggest complain: the lack of transactions combined with data denormalization pitfalls is a PITA to work around in code.

Overall just a great db for when you need a flexible schema.