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What about scalability? Trying to cluster and shard MySQL is a very difficult task, but with MongoDB it is trivial. No schema can be good, but scaling out easily is the big plus I see.

>but with MongoDB it is trivial

We did not have this experience when I worked at a large datamining company. It was a nightmare.

It would be interesting to hear what the difficulties were.

Mongo markets ease of sharding as an advantage, and if that is not the case at times, it limits the attractiveness of losing RDBMS features.

/dev/null is the most scalable system though, just fire up a node and it's there.

And your point is what ? MongoDB can replicate/shard without losing data.

It is just a setting you know that right ?

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