ClustrixDB is a clustered relational DBMS which is a drop-in MySQL replacement. It is ACID compliant and provides scalability and fault tolerance. It is a scale-out database built for high-value, high-transaction OLTP applications on cloud and on premise. It uses automatic data distribution, a sophisticated query planner, and a distributed execution model along with MVCC and PAXOS to provide scalability, concurrency and fault tolerance.
Paul Mikesell after working on EMC Isilon and Sergei Tsarev after working on a time-series database for AOL, came together to work on their common idea of a database that could handle transactions and also scale which led to Clustrix. Both of them started to build the database from scratch and decided to make the system MySQL compatible but add better ways of distributing and replicating data in the cluster. They worked with various SSD manufacturers to profile their devices and eventually started shipping a Clustrix Database Appliance in 2010. With cloud computing in the picture and commodity hardware quality improving, they released the first software version, ClustrixDB 5.0 in 2014 and discontinued the appliance.