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Do I regret choosing MongoDB a couple years ago to augment Postgres for several data analysis applications? Not really. But I do wish Mongo has been more mature. I'm happy to see each step forward taken, but it does bother me that often serious issues get overlooked for press-friendly feature additions. Until Mongo adopts some form of compression I won't be using for new projects aside from personal ones where development ease trumps everything else.

How about compression on the replication links?

When I inquired about that, they suggested using an ssh tunnel. I can see why they like mmapped files for storing data.

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