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SnappyData employee here. In general this is called the "HTAP" industry (Gartner's phrase: Hybrid Transactional/Analytical Processing).

SnappyData: https://www.snappydata.io, MemSQL: https://www.memsql.com/, Splice Machine: https://www.splicemachine.com/, SAP Hana: https://www.sap.com/products/hana.html, GridGain: https://www.gridgain.com/

are some of the technologies within it