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  • Picking an Active-Active Geo Distribution Strategy: Comparing Merge Replication and CRDT

    Modern distributed applications are fuelling the growing demand for distributed active-active, multi-master databases. While most popular databases support multi-master deployment, different databases employ different techniques. LWW, MVCC, merge replication and CRDTs deliver eventual consistency, offering read and write access with local latency and remaining available during network partitions.

  • Apache CouchDB: The Definitive Introduction

    Apache CouchDB is an open source document NoSQL database that uses JSON for storing documents. In this article, Jan Lehnardt gives an overview of CouchDB, its architecture and what problems it aims to solve and why it is different from all other databases.

  • Cassandra Mythology

    In this article, author Jonathan Ellis addresses the concerns of using Apache Cassandra NoSQL database, in terms of architecture, deployment and configuration, performance, query language (CQL), and database maturity.

  • Concurrency Controls in Data Replication

    Learn about leading concurrency control mechanisms used for data replication in distributed environments, comparing synchronous and asynchronous implementations with/without locking - techniques used by Oracle RAC, TimesTen, and GigaSpaces and NoSQL databases. Explore tradeoffs among performance, consistency, deadlocks, and conflicting updates in the context of a sample distributed application.

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