H-Store is an experimental database management system (DBMS).

[3][4][5] H-Store was promoted as a new class of parallel database management systems, called NewSQL,[6] that provide the high-throughput and high-availability of NoSQL systems, but without giving up the transactional consistency of a traditional DBMS known as ACID (atomicity, consistency, isolation and durability).

[8] H-Store is able to execute transaction processing with high throughput by forgoing many features of traditional relational database management systems.

Because it is single-threaded, only one transaction at a time can access the data stored on that partition.

By 2009, the VoltDB company developed a commercial version, and the H-Store research group shut down in 2016.