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Evaluation of replicas consistency characteristics in NoSQL databases


E.V. Tsviashchenko - Post-graduate Student, Bauman Moscow State Technical University; Leading Specialist, LLC “RPC “CRONOS-INFORM” (Moscow) E- mail:

While using replication on NoSQL databases the problem of replicas agreement is appeared. It is manifested as follows: once the record is updated on the one node, data on others nodes become stale. Consistency level can be adjusted by parameters (N, W, R): N –count of nodes, on which the record will be replicated eventually (may be with some latency); W – count of nodes (replicas), on which data has to be written in fact (after this, an answer about operation success will be send to user; if W


  1. Bailis P., Venkataraman S., Franklin M.J, Hellerstein J., Stoica I. Probabilistically Bounded Staleness for Practical Partial Quorums, [EHlektronnyjj resurs] [].


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