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Couchbase Server, originally known as Membase, is an open-source, distributed (shared-nothing architecture) NoSQL document-oriented database that is optimized for interactive applications. These applications must serve many concurrent users by creating, storing, retrieving, aggregating, manipulating and presenting data. In support of these kinds of application needs, Couchbase is designed to provide easy-to-scale key-value or document access with low latency and high sustained throughput. It is designed to be clustered from a single machine to very large-scale deployments spanning many machines. Couchbase Server provides on-the-wire client protocol compatibility with memcached, but is designed to add disk persistence, data replication, live cluster reconfiguration, rebalancing and multitenancy with data partitioning. In the parlance of Eric Brewer’s CAP theorem, Couchbase is a CP type system meaning it provides consistency and partition tolerance. However Couchbase Server can be set up as an AP system with multiple clusters using XDCR (Cross Data Center Replication). ==Product history== Membase was developed by several leaders of the memcached project, who had founded a company, NorthScale, to develop a key-value store with the simplicity, speed, and scalability of memcached, but also provided the storage, persistence and querying capabilities of a database. The original membase source code was contributed by NorthScale, and project co-sponsors Zynga and NHN to a new project on membase.org in June 2010. On February 8, 2011, the Membase project founders and Membase, Inc. announced a merger with CouchOne (a company with many of the principal players behind CouchDB) with an associated project merger. The merged company was called Couchbase, Inc. In January 2012, Couchbase released Couchbase Server 1.8. On December 2012, Couchbase Server 2.0 was released, with new features including a new JSON document store, indexing and querying, incremental MapReduce and cross datacenter replication.〔(【引用サイトリンク】title=Couchbase 2.0 released; implements JSON document store )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Couchbase Server」の詳細全文を読む スポンサード リンク
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