CouchDB vs MongoDB vs RethinkDB

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What is CouchDB?

Apache CouchDB is a database that uses JSON for documents, JavaScript for MapReduce indexes, and regular HTTP for its API. CouchDB is a database that completely embraces the web. Store your data with JSON documents. Access your documents and query your indexes with your web browser, via HTTP. Index, combine, and transform your documents with JavaScript.

What is MongoDB?

MongoDB stores data in JSON-like documents that can vary in structure, offering a dynamic, flexible schema. MongoDB was also designed for high availability and scalability, with built-in replication and auto-sharding.

What is RethinkDB?

RethinkDB is built to store JSON documents, and scale to multiple machines with very little effort. It has a pleasant query language that supports really useful queries like table joins and group by, and is easy to setup and learn.
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      What are some alternatives to CouchDB, MongoDB, and RethinkDB?
      Developed as an alternative to traditionally inflexible SQL databases, the Couchbase NoSQL database is built on an open source foundation and architected to help developers solve real-world problems and meet high scalability demands.
      Cloudant’s distributed database as a service (DBaaS) allows developers of fast-growing web and mobile apps to focus on building and improving their products, instead of worrying about scaling and managing databases on their own.
      Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry. MariaDB is designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance.
      Redis is an open source, BSD licensed, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.
      Riak is a distributed database designed to deliver maximum data availability by distributing data across multiple servers. As long as your client can reach one Riak server, it should be able to write data. In most failure scenarios, the data you want to read should be available, although it may not be the most up-to-date version of that data.
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      Decisions about CouchDB, MongoDB, and RethinkDB
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      How developers use CouchDB, MongoDB, and RethinkDB
      Avatar of Tarun Singh
      Tarun Singh uses MongoDBMongoDB

      Used MongoDB as primary database. It holds trip data of NYC taxis for the year 2013. It is a huge dataset and it's primary feature is geo coordinates with pickup and drop off locations. Also used MongoDB's map reduce to process this large dataset for aggregation. This aggregated result was then used to show visualizations.

      Avatar of Trello
      Trello uses MongoDBMongoDB

      MongoDB fills our more traditional database needs. We knew we wanted Trello to be blisteringly fast. One of the coolest and most performance-obsessed teams we know is our next-door neighbor and sister company StackExchange. Talking to their dev lead David at lunch one day, I learned that even though they use SQL Server for data storage, they actually primarily store a lot of their data in a denormalized format for performance, and normalize only when they need to.

      Avatar of Foursquare
      Foursquare uses MongoDBMongoDB

      Nearly all of our backend storage is on MongoDB. This has also worked out pretty well. It's enabled us to scale up faster/easier than if we had rolled our own solution on top of PostgreSQL (which we were using previously). There have been a few roadbumps along the way, but the team at 10gen has been a big help with thing.

      Avatar of King's Digital Lab
      King's Digital Lab uses CouchDBCouchDB

      Document (JSON) DB.

      • - queries must be pre-defined as views (not as flexible as query formulation on the fly)
      • - community and ecosystem not as large as mongodb
      • + PouchDB is an excellent JS library to interact with CouchDB or even work in offline-then-sync moce
      Avatar of AngeloR
      AngeloR uses MongoDBMongoDB

      We are testing out MongoDB at the moment. Currently we are only using a small EC2 setup for a delayed job queue backed by agenda. If it works out well we might look to see where it could become a primary document storage engine for us.

      Avatar of Matt Welke
      Matt Welke uses MongoDBMongoDB

      Used for proofs of concept and personal projects with a document data model, especially with need for strong geographic queries. Often not chosen in long term apps due to chance data model can end up relational as needs develop.

      Avatar of Smileupps
      Smileupps uses CouchDBCouchDB

      By being built on, of, in and around CouchDB, Smileupps offers to its customers secure and reliable CouchDB hosting and a CouchDB-based app store to build and sell serious business-enabled web applications

      Avatar of Sine Wave Entertainment
      Sine Wave Entertainment uses RethinkDBRethinkDB

      High-speed update-aware storage used in our region server infrastructure; provides a good middle layer for storage of rapidly modified information.

      Avatar of Runbook
      Runbook uses RethinkDBRethinkDB

      Main database, using it in multiple datacenters in an active-active configuration.

      Avatar of Tobe O
      Tobe O uses RethinkDBRethinkDB

      Angel includes support for multiple databases, out-of-the-box.

      Avatar of Giant Swarm
      Giant Swarm uses CouchDBCouchDB

      We use CouchDB in an internal analysis tool for usage data.

      Avatar of Mike MacCana
      Mike MacCana uses RethinkDBRethinkDB

      As a boring document oriented database with safe defaults.

      Avatar of Mathias Vonende
      Mathias Vonende uses CouchDBCouchDB

      Storage for unstructured, linked and timeseries data.

      Avatar of Domraider
      Domraider uses RethinkDBRethinkDB

      Sharded and replicated storage, NoSQL with joins

      Avatar of Aaron Buchanan
      Aaron Buchanan uses CouchDBCouchDB

      json store + geo + _changes

      How much does CouchDB cost?
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