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Pretty much what I was trying to figure out. I can't see a use case here, since we already have things like Berkeley DB and LevelDB. But main memory? Your use case would have to be such that your entire dataset can fit in memory and for some reason you need extreme performance from that dataset, and from multiple processes running on a single machine. I just don't see it. Is the caching performance of other databases so horrible that this is really necessary?

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