In-Memory database and In-Memory engine.

Now-a-days almost every relational or non-relational database gives in-memory capability. Traditional database vendor gives this capability using add-on in-memory engine and some are also specialized vendors.

MySQL have in-memory table engine,
SQL server have in-Memory OLTP engine,
SAP has HANA,
Oracle have TimesTen,
Mongodb have separate in-memory services.

These all are version and edition dependent. To use this we need extra licensing cost. Apart from that there are some popular specialized in-memory database vendor like

Redis,
Aerospike,
VoltDB and
Arangodb.

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