Apache CouchDB

What is Apache CouchDB?
Apache CouchDB is a non-relational, or NoSQL, database designed to completely capture the web. Data is stored in JSON documents that can be accessed and whose indices are queried via HTTP.
Indexing, transforming and combining documents is done using JavaScript. Because it uses all of these web-friendly standards and technologies, CouchDB works very well with web and mobile applications.

CouchDB is an open source document-oriented database that uses key-value cards to store document fields.

The fields can be simple key / value pairs, cards or lists. Each saved document is given a unique identifier at the document level and a revision number when changes are made to it. CouchDB is able to perform both document transformations and real-time change notifications and simplify the development of web applications.

It specializes in availability and partition tolerance (AP), but with a little work it can be consistent. By comparison, MongoDB is mostly consistency and partition tolerant.

CouchDB features:

- Fast indexing and retrieval

- Simple replication across multiple server instances

- Multiple libraries for different languages

- JSON-based document format

- REST-like interface for retrieving, deleting, updating and inserting documents

- Data feed updates that can be subscribed to via the change feed

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