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> (I understand it also can be "fully durable" but it is not by default due to speed concerns)

Just a little addendum: MongoDB has been "durable by default" since v1.7 I believe (current: 2.0.6).

Since 2.0, the journal is enabled. It flushes to disk every 100ms. Operations can return successfully without writing the data to disk. This is similar to what MemSQL is offering by default.

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