> in-memory database holds only a limited set of data MemSQL is not just in-memory, but also has column-store (note: I don't know VoltDB). You can think of Mem

> in-memory database holds only a limited set of data MemSQL is not just in-memory, but also has column-store (note: I don't know VoltDB). You can think of MemSQL not as "does everything in-memory", but "uses memory at the best".