[numlock86]

Hm, my impression was always that if I have such data I didn't really understand my data yet. What's a concrete prime example for using MongoDB?

[staysaasy]

That's actually kind of the point – if you're working on a new project whose requirements might change rapidly Mongo can be a really great fit (eg a toy project; a prototype for a new internal service; a hackathon; a pre-traction startup).