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Consistency Models of NoSQL Databases

Department of Informatics Engineering, University of Coimbra, Coimbra 3030-290, Portugal
Centre of Informatics and Systems of University of Coimbra (CISUC), Coimbra 3030-290, Portugal
ISEC—Coimbra Institute of Engineering, Polytechnic of Coimbra, Coimbra 3030-199, Portugal
Author to whom correspondence should be addressed.
Future Internet 2019, 11(2), 43;
Received: 30 December 2018 / Revised: 2 February 2019 / Accepted: 11 February 2019 / Published: 14 February 2019
(This article belongs to the Special Issue 10th Anniversary Feature Papers)
PDF [2119 KB, uploaded 14 February 2019]


Internet has become so widespread that most popular websites are accessed by hundreds of millions of people on a daily basis. Monolithic architectures, which were frequently used in the past, were mostly composed of traditional relational database management systems, but quickly have become incapable of sustaining high data traffic very common these days. Meanwhile, NoSQL databases have emerged to provide some missing properties in relational databases like the schema-less design, horizontal scaling, and eventual consistency. This paper analyzes and compares the consistency model implementation on five popular NoSQL databases: Redis, Cassandra, MongoDB, Neo4j, and OrientDB. All of which offer at least eventual consistency, and some have the option of supporting strong consistency. However, imposing strong consistency will result in less availability when subject to network partition events. View Full-Text
Keywords: consistency models; NoSQL databases; redis; cassandra; MongoDB; Neo4j; OrientDB consistency models; NoSQL databases; redis; cassandra; MongoDB; Neo4j; OrientDB

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Diogo, M.; Cabral, B.; Bernardino, J. Consistency Models of NoSQL Databases. Future Internet 2019, 11, 43.

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