NoSQL showdown: MongoDB vs. Couchbase | InfoWorld
Couchbase Server - Wikipedia, the free encyclopedia
Couchbase is created a derivative of CouchDB, with intention to get high performance.
CouchDB is based on Erlang, so it is highly reliable, but Erlang is not optimal for handling strings and documents. So parts of the system ware moved to C, and later integrated with Memcached to get a high-performance system... With increased investments in "Big Data", NoSQL etc,
there is an increased competition...