[nrser]

NoSQL has real use cases. The model is much closer to how you usually are structuring and handling data in your application. If you application is handling hierarchically structured, variously shaped, low-relational data - which many are because that's pretty much the default for how programming languages work - and does it's data processing and validation at the application level, then it can be nice to have a storage system that matches that closely.

It's that situation where a single structured User object would "foil-out" to like 10 de-normalized tables. It feels ridiculous. It often is a bit ridiculous. Also, I'm not sure how much Open Source RDBMS have improved in the last 8 years, but I know for a fact that MySQL used to just melt under joins like that with any serious load.

As far as the recent OS RDBMS JSON additions, they're just that - recent additions. They feel tacked on. They're treated differently then first-level values. Support in ORMs is lacking. It's hard to find examples online. They're not nearly as easy to use and well supported as hierarchical data is in systems build around it from the ground up (of course).

As far as why MongoDB... because it's the most popular solution. If you hit a problem, someone had probably hit it before, and you can probably find some material online. The leading drivers and libraries are relatively mature and widely used. It makes it a much safer bet as far as tractability of issues you will hit.

I don't really like MongoDB, but the case for using it seems pretty strait-forward to me.

[curiousDog]

Sure, but why wouldn't you use one of the myriad of options offered by Google/Microsoft/Amazon? Dynamodb, BigTable, DocumentDb would be better options instead of betting on a startup, no? Their NoSQL tech was novel several years ago and not the cloud providers are far ahead and there's no way MongoDb will be able to catch up in-terms of Features, Scale, Reliability and Availability

[nrser]

I think all of those services are cloud-based, yeah?

Cloud services are a great option to have available, but there are many reasons organizations choose to manage their own instances... pre-existing infrastructure investment, flexibility, data location and control, cost structure, regulatory requirements, etc.

I read here that Mongo has started a cloud-based offering, but the core of their business competes against other self-managed storage software like MySQL, Postgres, Hadoop, etc.