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Re:CockroachDB Skitters into Beta by ngrilly on Thursday March 31, 2016 @03:06AM (#11395494)
HyPer and MemSQL are in-memory databases. CockroachDB is not. This is a big difference.

And according to HyPer home page, HyPer doesn't look distributed, which is another big difference.

Re:CockroachDB Skitters into Beta by ericfrenkiel on Thursday March 31, 2016 @05:04PM (#11400540)
MemSQL used to be just in-memory. It added a second storage engine designed to hold data on disk using a column store.