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Couchbase is typically used as the system of record for interactive software systems – replacing the role previously played by relational database technology like MySQL or Oracle. The key-value operations that were supported by Membase certainly allowed useful systems to be built, but a simple key-value store can’t answer even simple questions such as “which users currently have a sheep on their farm?” In order to answer that question on a pure key-value store, the application must read the entire database, key by key, then “look inside” the value part of the key-value pair to see if there is a sheep inside. By embedding CouchDB, the database can now do that work on behalf of the application and without the need for a full database scan (because CouchDB can maintain an index that speeds that kind of query).

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