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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.
  1. MySQL have in-memory table engine, 
  2. SQL server have in-Memory OLTP engine, 
  3. SAP has HANA, 
  4. Oracle have TimesTen,  
  5. 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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