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Mongo got a lot better about reusing disk space in v2.2, if you are deleting from a collection. Still no compression or document field name optimizations though.

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Couldn't resist: try tokumx if you want "mongodb with compression". There isn't a speed/space usage tradeoff. Our latest blog post is about long field names: http://www.tokutek.com/2013/08/tokumx-tip-create-any-field-n...

Interesting product. They also have a mariadb engine (different use cases).

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