Apache CouchDB

<h2 id="history">History</h2>
Couch is an acronym for cluster of unreliable commodity hardware.<a class="footnote-ref" id="fnref:3" href="#fn:3">3</a> 
The CouchDB project was created in April 2005 by Damien Katz, a former <a href="/facts/Lotus_Notes/X3KHrPQj">Lotus Notes</a> developer at <a href="/facts/IBM/QszA7nwd">IBM</a>. He self-funded the project for almost two years and released it as an open-source project under the <a href="/facts/GNU_General_Public_License/S75KhLSX">GNU General Public License</a>.
In February 2008, it became an Apache Incubator project and was offered under the <a href="/facts/Apache_License/5AeIjas8">Apache License</a> instead.<a class="footnote-ref" id="fnref:4" href="#fn:4">4</a> A few months after, it graduated to a top-level project.<a class="footnote-ref" id="fnref:5" href="#fn:5">5</a> This led to the first stable version being released in July 2010.<a class="footnote-ref" id="fnref:6" href="#fn:6">6</a>
In early 2012, Katz left the project to focus on <a href="/facts/Couchbase_Server/zJA7EJMQ">Couchbase Server</a>.<a class="footnote-ref" id="fnref:7" href="#fn:7">7</a>
Since Katz's departure, the Apache CouchDB project has continued, releasing 1.2 in April 2012 and 1.3 in April 2013. In July 2013, the CouchDB community merged the codebase for <a href="/facts/BigCouch/T7hjaCcw">BigCouch</a>, <a href="/facts/Cloudant/R9gqRge6">Cloudant</a>'s clustered version of CouchDB, into the Apache project.<a class="footnote-ref" id="fnref:8" href="#fn:8">8</a> The BigCouch clustering framework is included in the current release of Apache CouchDB.<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a>
Native clustering is supported at version 2.0.0. And the new Mango Query Server provides a simple JSON-based way to perform CouchDB queries without JavaScript or MapReduce. Also in version 2.0.0 was the introduction of Fauxton, the new built-in web interface, to replace Futon, the old built-in web interface.<a class="footnote-ref" id="fnref:10" href="#fn:10">10</a>

<h2 id="main-features">Main features</h2>
ACID Semantics
CouchDB provides <a href="/facts/Atomicity%2c_consistency%2c_isolation%2c_durability/XdHkYzHN">ACID</a> semantics.<a class="footnote-ref" id="fnref:11" href="#fn:11">11</a> It does this by implementing a form of <a href="/facts/Multi-Version_Concurrency_Control/bktUeU82">Multi-Version Concurrency Control</a>, meaning that CouchDB can handle a high volume of concurrent readers and writers without conflict.
Built for Offline
CouchDB can replicate to devices (like smartphones) that can go offline and handle data sync for you when the device is back online.
Distributed Architecture with Replication
CouchDB was designed with bi-directional replication (or synchronization) and off-line operation in mind. That means multiple replicas can have their own copies of the same data, modify it, and then sync those changes at a later time.
Document Storage
CouchDB stores data as "documents", as one or more field/value pairs expressed as <a href="/facts/JSON/bs1rUAhd">JSON</a>. Field values can be simple things like strings, numbers, or dates; but <a href="/facts/Array_data_structure/BKGvF8AM">ordered lists</a> and <a href="/facts/Associative_array/IFGd2xcP">associative arrays</a> can also be used. Every document in a CouchDB database has a unique id and there is no required document schema.
Eventual Consistency
CouchDB guarantees <a href="/facts/Eventual_consistency/Un19vCr0">eventual consistency</a> to be able to provide both availability and partition tolerance.
Map/Reduce Views and Indexes
The stored data is structured using views. In CouchDB, each view is constructed by a <a href="/facts/JavaScript/XhhIIEsl">JavaScript</a> function that acts as the Map half of a <a href="/facts/Map_(higher-order_function)/GdzN4UJl">map</a>/reduce operation. The function takes a document and transforms it into a single value that it returns. CouchDB can index views and keep those indexes updated as documents are added, removed, or updated.
HTTP API
All items have a unique URI that gets exposed via HTTP. It uses the <a href="/facts/Hypertext_Transfer_Protocol/TWtvf7JD">HTTP methods</a> POST, GET, PUT and DELETE for the four basic <a href="/facts/Create%2c_read%2c_update_and_delete/8KwxY2eH">CRUD</a> (Create, Read, Update, Delete) operations on all resources.
CouchDB also offers a built-in administration interface accessible via Web called Fauxton.<a class="footnote-ref" id="fnref:12" href="#fn:12">12</a>

<h2 id="use-cases-and-production-deployments">Use cases and production deployments</h2>
Replication and synchronization capabilities of CouchDB make it ideal for using it in mobile devices, where network connection is not guaranteed, and the application must keep on working offline.
CouchDB is well suited for applications with accumulating, occasionally changing data, on which pre-defined queries are to be run and where versioning is important (CRM, CMS systems, by example). Master-master replication is an especially interesting feature, allowing easy multi-site deployments.<a class="footnote-ref" id="fnref:13" href="#fn:13">13</a>

<h3>Users</h3>
Users of CouchDB include:

<ul><li><a href="/facts/CERN/y1gwRchm">CERN</a> uses CouchDB as database for the Data Management System at the <a href="/facts/Large_Hadron_Collider/XWJCFSqT">Large Hadron Collider</a>.<a class="footnote-ref" id="fnref:14" href="#fn:14">14</a></li>
<li><a href="/facts/Red_Cross/KcT9EGnA">Red Cross</a> use the application iDAT for completing casework electronically in disaster areas. Here CouchDB is used as multi-node peer-to-peer offline-first database.<a class="footnote-ref" id="fnref:15" href="#fn:15">15</a></li>
<li><a href="/facts/IBM/QszA7nwd">IBM</a> Cloud services are based at a fundamental level on CouchDB.<a class="footnote-ref" id="fnref:16" href="#fn:16">16</a></li>
<li><a href="/facts/United_Airlines/0tCTdbNh">United Airlines</a> uses CouchDB for the in-flight entertainment systems in over 3,000 planes.<a class="footnote-ref" id="fnref:17" href="#fn:17">17</a><a class="footnote-ref" id="fnref:18" href="#fn:18">18</a></li>
<li><a href="/facts/Amadeus_IT_Group/XhQSSWWG">Amadeus IT Group</a>, for some of their back-end systems.</li>
<li><a href="/facts/Credit_Suisse/uzwg4qM1">Credit Suisse</a>, for internal use at commodities department for their marketplace framework.<a class="footnote-ref" id="fnref:19" href="#fn:19">19</a>[better source needed]</li>
<li><a href="/facts/Meebo/UX5uomdX">Meebo</a>, for their social platform (Web and applications). Meebo was acquired by Google and most products were shut down on July 12, 2012.<a class="footnote-ref" id="fnref:20" href="#fn:20">20</a></li>
<li><a href="/facts/Npm_(software)/wJg3ebn2">npm</a> uses CouchDB as replicating database for their package registry.<a class="footnote-ref" id="fnref:21" href="#fn:21">21</a></li>
<li><a href="/facts/Sophos/6oHmdqg0">Sophos</a>, for some of their back-end systems.</li>
<li><a href="/facts/BBC/qFateIz8">BBC</a>, for a dynamic CMS-Platform.<a class="footnote-ref" id="fnref:22" href="#fn:22">22</a></li>
<li><a href="/facts/Canonical_(company)/76WPw1uW">Canonical</a> began using it in 2009 for its synchronization service "Ubuntu One",<a class="footnote-ref" id="fnref:23" href="#fn:23">23</a> but stopped using it in November 2011.<a class="footnote-ref" id="fnref:24" href="#fn:24">24</a></li>
<li><a href="/facts/Canal%252B_(French_TV_channel)/GTxPcseq">CANAL+</a> for international on-demand platform at CANAL+ Overseas.</li>
<li>Protogrid, as storage back-end for their rapid application development framework <a class="footnote-ref" id="fnref:25" href="#fn:25">25</a></li></ul>
<h2 id="data-manipulation-documents-and-views">Data manipulation: documents and views</h2>
CouchDB manages a collection of <a href="/facts/JSON/bs1rUAhd">JSON</a> documents. The documents are organised via views. Views are defined with <a href="/facts/Aggregate_function/685obrqz">aggregate functions</a> and filters are computed in parallel, much like <a href="/facts/MapReduce/KbfxJ5vV">MapReduce</a>.
Views are generally stored in the database and their indexes are updated continuously. CouchDB supports a view system using external socket servers and a JSON-based protocol.<a class="footnote-ref" id="fnref:26" href="#fn:26">26</a> As a consequence, view servers have been developed in a variety of languages (JavaScript is the default, but there are also PHP, Ruby, Python and Erlang).

<h3>Accessing data via HTTP</h3>
Applications interact with CouchDB via HTTP. The following demonstrates a few examples using <a href="/facts/CURL/01m2dW2j">cURL</a>, a command-line utility. These examples assume that CouchDB is running on <a href="/facts/Localhost/an0qLQq8">localhost</a> (127.0.0.1) on port 5984.

<table><tbody><tr><th>Action</th><th>Request</th><th>Response</th></tr><tr><td>Accessing server information</td><td>curl http://127.0.0.1:5984/</td><td>{ "couchdb": "Welcome", "version":"1.1.0"}</td></tr><tr><td>Creating a database named wiki</td><td>curl -X PUT http://127.0.0.1:5984/wiki</td><td>{"ok": true}</td></tr><tr><td>Attempting to create a second database named wiki</td><td>curl -X PUT http://127.0.0.1:5984/wiki</td><td>{ "error":"file_exists", "reason":"The database could not be created, the file already exists."}</td></tr><tr><td>Retrieve information about the wiki database</td><td>curl http://127.0.0.1:5984/wiki</td><td>{ "db_name": "wiki", "doc_count": 0, "doc_del_count": 0, "update_seq": 0, "purge_seq": 0, "compact_running": false, "disk_size": 79, "instance_start_time": "1272453873691070", "disk_format_version": 5}</td></tr><tr><td>Delete the database wiki</td><td>curl -X DELETE http://127.0.0.1:5984/wiki</td><td>{"ok": true}</td></tr><tr><td>Create a document, asking CouchDB to supply a document id</td><td>curl -X POST -H "Content-Type: application/json" --data \'{ "text" : "Wikipedia on CouchDB", "rating": 5 }' \http://127.0.0.1:5984/wiki</td><td>{ "ok": true, "id": "123BAC", "rev": "946B7D1C"}</td></tr><tr><td>get a list of databases</td><td>curl http://127.0.0.1:5984/_all_dbs</td><td>["_replicator","_users","wiki"]</td></tr></tbody></table>
<h2 id="open-source-components">Open source components</h2>
CouchDB includes a number of other open source projects as part of its default package.

<table><tbody><tr><th>Component</th><th>Description</th><th>License</th></tr><tr><td><a href="/facts/Erlang_(programming_language)/2PuxmzT3">Erlang</a></td><td>Erlang is a general-purpose <a href="/facts/Concurrent_computing/yVzQBPr9">concurrent</a> <a href="/facts/Programming_language/cWTYbgWa">programming language</a> and <a href="/facts/Run_time_system/YmCuC4xP">runtime</a> system. The sequential subset of Erlang is a <a href="/facts/Functional_language/cdxqPEIM">functional language</a> with <a href="/facts/Strict_evaluation/vLXH27zR">strict evaluation</a>, <a href="/facts/Single_assignment/kLevAoyJ">single assignment</a>, and <a href="/facts/Dynamic_typing/Tz0bAMS9">dynamic typing</a></td><td><a href="/facts/Apache_License/5AeIjas8">Apache 2.0</a> (Release 18.0 and later)<a href="/facts/Erlang_Public_License/FCqpmCWJ">Erlang Public License</a> (Earlier releases)</td></tr><tr><td><a href="/facts/International_Components_for_Unicode/SVyD2Yr5">ICU</a></td><td>International Components for Unicode (ICU) is an <a href="/facts/Open-source_software/HzTaB8E9">open-source</a> project of mature <a href="/facts/C_(programming_language)/Ky2No763">C</a>/<a href="/facts/C%252B%252B/Et0F2qn9">C++</a> and <a href="/facts/Java_(programming_language)/9ScgFyAL">Java</a> libraries for <a href="/facts/Unicode/DDu3MfPV">Unicode</a> support, software <a href="/facts/Internationalization/QpnqEC7H">internationalization</a> and software globalization</td><td>Unicode License</td></tr><tr><td><a href="/facts/JQuery/YIqFG0ww">jQuery</a></td><td>jQuery is a lightweight <a href="/facts/Cross-browser/3pgytz0u">cross-browser</a> <a href="/facts/JavaScript_library/vjUJ5DGC">JavaScript library</a> that emphasizes interaction between <a href="/facts/JavaScript/XhhIIEsl">JavaScript</a> and <a href="/facts/HTML/sSc3fT78">HTML</a></td><td><a href="/facts/MIT_License/8llAQtlk">MIT License</a></td></tr><tr><td><a href="/facts/OpenSSL/aXvs5fo2">OpenSSL</a></td><td>OpenSSL is an <a href="/facts/Open-source_software/HzTaB8E9">open-source</a> implementation of the <a href="/facts/Transport_Layer_Security/pGy16TnA">SSL and TLS</a> protocols. The core <a href="/facts/Library_(computer_science)/xRzL3P7q">library</a> (written in the <a href="/facts/C_(programming_language)/Ky2No763">C programming language</a>) implements the basic <a href="/facts/Cryptography/e94PEVau">cryptographic</a> functions and provides various utility functions</td><td><a href="/facts/Apache_License/5AeIjas8">Apache 1.0</a> and the <a href="/facts/BSD_License/XLtmLp5x">four-clause BSD License</a></td></tr><tr><td><a href="/facts/SpiderMonkey/YosPe1Bv">SpiderMonkey</a></td><td>SpiderMonkey is a performant <a href="/facts/JavaScript_engine/6YEG2JFH">JavaScript engine</a> maintained by the <a href="/facts/Mozilla_Foundation/Y1xYJsDm">Mozilla Foundation</a>. It contains an <a href="/facts/Interpreted_language/JB85fbyb">interpreter</a>, a <a href="/facts/JIT_compiler/rEYDsd8l">JIT compiler</a> and a <a href="/facts/Garbage_collection_(computer_science)/j2vlIu7g">garbage collector</a></td><td><a href="/facts/Mozilla_Public_License/hBuvAz1w">MPL 2.0</a></td></tr></tbody></table>
<h2 id="see-also">See also</h2>
<ul>
<li>Free and open-source software portal</li></ul>
<ul><li><a href="/facts/Document-oriented_database/ttVRBHG4">Document-oriented database</a></li>
<li><a href="/facts/XML_database/PerYsNou">XML database</a></li></ul>

<h2 id="bibliography">Bibliography</h2>
<ul><li>Anderson, J. Chris; Slater, Noah; Lehnardt, Jan (November 15, 2009), <a href="http://guide.couchdb.org/editions/1/en/index.html">CouchDB: The Definitive Guide</a> (1st ed.), <a href="/facts/O%2527Reilly_Media/Fr3Kv7sm">O'Reilly Media</a>, p. 300, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0-596-15816-3</li>
<li>Lennon, Joe (December 15, 2009), <a href="https://web.archive.org/web/20101205154416/http://apress.com/book/view/9781430272373">Beginning CouchDB</a> (1st ed.), <a href="/facts/Apress/pxdyEeD3">Apress</a>, p. 300, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-1-4302-7237-3, archived from <a href="http://www.apress.com/book/view/9781430272373">the original</a> on December 5, 2010, retrieved November 1, 2009</li>
<li>Holt, Bradley (March 7, 2011), <a href="http://oreilly.com/catalog/0636920018247">Writing and Querying MapReduce Views in CouchDB</a> (1st ed.), <a href="/facts/O%2527Reilly_Media/Fr3Kv7sm">O'Reilly Media</a>, p. 76, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-1-4493-0312-9</li>
<li>Holt, Bradley (April 11, 2011), <a href="http://oreilly.com/catalog/9781449303433">Scaling CouchDB</a> (1st ed.), <a href="/facts/O%2527Reilly_Media/Fr3Kv7sm">O'Reilly Media</a>, p. 72, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-1-4493-0343-3</li>
<li>Brown, MC (October 31, 2011), <a href="http://oreilly.com/catalog/9781449307554">Getting Started with CouchDB</a> (1st ed.), <a href="/facts/O%2527Reilly_Media/Fr3Kv7sm">O'Reilly Media</a>, p. 50, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-1-4493-0755-4</li>
<li>Thompson, Mick (August 2, 2011), <a href="http://oreilly.com/catalog/9781449307523">Getting Started with GEO, CouchDB, and Node.js</a> (1st ed.), <a href="/facts/O%2527Reilly_Media/Fr3Kv7sm">O'Reilly Media</a>, p. 64, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-1-4493-0752-3</li></ul>
<h2 id="external-links">External links</h2>
<ul><li><a href="https://couchdb.apache.org">Official website</a></li>
<li><a href="https://web.archive.org/web/20090831050402/http://books.couchdb.org/relax/">CouchDB: The Definitive Guide</a></li>
<li><a href="https://web.archive.org/web/20160303172725/http://wiki.apache.org/couchdb/Complete_HTTP_API_Reference">Complete HTTP API Reference</a></li>
<li><a href="https://github.com/1999/couchdb-php">Simple PHP5 library to communicate with CouchDB</a></li>
<li><a href="https://code.google.com/p/async-couchdb-client/">Asynchronous CouchDB client for Java</a></li>
<li><a href="https://github.com/KimStebel/sprouch">Asynchronous CouchDB client for Scala</a></li>
<li>Lehnardt, Jan (2008). <a href="https://web.archive.org/web/20121109191546/http://video.google.com/videoplay?docid=-3714560380544574985&hl=en">"Couch DB at 10,000 feet"</a>. Erlang eXchange 2008. Archived from <a href="http://video.google.com/videoplay?docid=-3714560380544574985&hl=en">the original</a> on 9 November 2012. Retrieved 15 April 2012.</li>
<li>Lenhardt, Jan (2009). <a href="https://web.archive.org/web/20110619041527/http://www.erlang-factory.com/conference/London2009/speakers/janlehnardt">"CouchDB for Erlang Developers"</a>. Erlang Factory London 2009. Archived from <a href="http://www.erlang-factory.com/conference/London2009/speakers/janlehnardt">the original</a> on 19 June 2011. Retrieved 15 April 2012.</li>
<li>Katz, Damien (January 2009). <a href="https://web.archive.org/web/20110427212129/http://www.infoq.com/presentations/katz-couchdb-and-me">"CouchDB and Me"</a>. RubyFringe. InfoQ. Archived from <a href="http://www.infoq.com/presentations/katz-couchdb-and-me">the original</a> on 27 April 2011. Retrieved 15 April 2012.</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1">Apache Software Foundation. "Apache CouchDB". Retrieved 15 April 2012. <a href="https://couchdb.apache.org/" target="_blank">https://couchdb.apache.org/</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></li>
<li id="fn:2">Smith, Jason. "What is the CouchDB replication protocol? Is it like Git?". StackOverflow. Stack Exchange. Retrieved 14 April 2012. <a href="https://stackoverflow.com/a/4766398/395287" target="_blank">https://stackoverflow.com/a/4766398/395287</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></li>
<li id="fn:3">"Exploring CouchDB". Developer Works. IBM. March 31, 2009. Retrieved September 30, 2016. <a href="http://www.ibm.com/developerworks/opensource/library/os-couchdb/index.html" target="_blank">http://www.ibm.com/developerworks/opensource/library/os-couchdb/index.html</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></li>
<li id="fn:4">Apache mailing list announcement on mail-archives.apache.org <a href="https://mail-archives.apache.org/mod_mbox/incubator-general/200802.mbox/%3c3d4032300802121136p361b52ceyfc0f3b0ad81a1793@mail.gmail.com%3e" target="_blank">https://mail-archives.apache.org/mod_mbox/incubator-general/200802.mbox/%3c3d4032300802121136p361b52ceyfc0f3b0ad81a1793@mail.gmail.com%3e</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></li>
<li id="fn:5">Re: Proposed Resolution: Establish CouchDB TLP on mail-archives.apache.org <a href="https://mail-archives.apache.org/mod_mbox/incubator-couchdb-dev/200811.mbox/%3c3F352A54-5FC8-4CB0-8A6B-7D3446F07462@jaguNET.com%3e" target="_blank">https://mail-archives.apache.org/mod_mbox/incubator-couchdb-dev/200811.mbox/%3c3F352A54-5FC8-4CB0-8A6B-7D3446F07462@jaguNET.com%3e</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></li>
<li id="fn:6">"CouchDB NoSQL Database Ready for Production Use" Archived 2010-11-15 at the Wayback Machine, article from PC World of July 2010 <a href="https://www.pcworld.com/article/201046/couchdb_nosql_database_ready_for_production_use.html" target="_blank">https://www.pcworld.com/article/201046/couchdb_nosql_database_ready_for_production_use.html</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></li>
<li id="fn:7">Katz, Damien. "The future of CouchDB". Retrieved 15 April 2012. <a href="http://damienkatz.net/2012/01/the_future_of_couchdb.html" target="_blank">http://damienkatz.net/2012/01/the_future_of_couchdb.html</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></li>
<li id="fn:8">Slater, Noah (25 July 2013). "Welcome BigCouch". Retrieved 25 July 2013. <a href="https://blogs.apache.org/couchdb/entry/welcome_bigcouch" target="_blank">https://blogs.apache.org/couchdb/entry/welcome_bigcouch</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></li>
<li id="fn:9">"'2.0'". 20 September 2016. Retrieved 13 January 2017. <a href="https://blog.couchdb.org/2016/09/20/2-0/" target="_blank">https://blog.couchdb.org/2016/09/20/2-0/</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></li>
<li id="fn:10">"1.8. 2.0.x Branch — Apache CouchDB® 3.3 Documentation". docs.couchdb.org. Retrieved 2024-08-04. <a href="https://docs.couchdb.org/en/stable/whatsnew/2.0.html" target="_blank">https://docs.couchdb.org/en/stable/whatsnew/2.0.html</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></li>
<li id="fn:11">CouchDB, Technical Overview Archived October 20, 2011, at the Wayback Machine <a href="https://couchdb.apache.org/docs/overview.html" target="_blank">https://couchdb.apache.org/docs/overview.html</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></li>
<li id="fn:12">"couchdb-fauxton". GitHub. apache. Retrieved 2 May 2023. <a href="https://github.com/apache/couchdb-fauxton" target="_blank">https://github.com/apache/couchdb-fauxton</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></li>
<li id="fn:13">Cassandra vs MongoDB vs CouchDB vs Redis vs Riak vs HBase comparison from Kristóf Kovács <a href="http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis" target="_blank">http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></li>
<li id="fn:14">"Why Large Hadron Collider Scientists are Using CouchDB". ReadWrite. 2010-08-26. Retrieved 2022-03-29. <a href="https://readwrite.com/lhc-couchdb/" target="_blank">https://readwrite.com/lhc-couchdb/</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></li>
<li id="fn:15">iDAT, Red Cross Code, 2021-07-31, retrieved 2022-03-29 <a href="https://github.com/redcross/idat" target="_blank">https://github.com/redcross/idat</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></li>
<li id="fn:16">"Database-Deep-Dives-CouchDB". www.ibm.com. 19 July 2019. Retrieved 2022-03-29. <a href="https://www.ibm.com/cloud/blog/database-deep-dives-couchdb" target="_blank">https://www.ibm.com/cloud/blog/database-deep-dives-couchdb</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></li>
<li id="fn:17">"Database-Deep-Dives-CouchDB". www.ibm.com. 19 July 2019. Retrieved 2022-03-29. <a href="https://www.ibm.com/cloud/blog/database-deep-dives-couchdb" target="_blank">https://www.ibm.com/cloud/blog/database-deep-dives-couchdb</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></li>
<li id="fn:18">"United Airlines Streamlines Operations With Couchbase | Case Study". www.couchbase.com. Retrieved 2022-03-29. <a href="https://www.couchbase.com/customers/united-airlines" target="_blank">https://www.couchbase.com/customers/united-airlines</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></li>
<li id="fn:19">"CouchDB in the wild" Archived 2017-07-20 at the Wayback Machine article of the product's Web, a list of software projects and websites using CouchDB <a href="https://wiki.apache.org/couchdb/CouchDB_in_the_wild" target="_blank">https://wiki.apache.org/couchdb/CouchDB_in_the_wild</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></li>
<li id="fn:20">Cutler, Kim-Mai (9 June 2012). "Meebo Gets The Classic Google Acq-hire Treatment: Most Products To Shut Down Soon". TechCrunch. AOL Inc. Retrieved 7 January 2016. <a href="https://techcrunch.com/2012/06/09/meebo-product-shutdown/" target="_blank">https://techcrunch.com/2012/06/09/meebo-product-shutdown/</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></li>
<li id="fn:21">"npm-registry-couchapp". GitHub. npm. 17 June 2015. Retrieved 7 January 2016. <a href="https://github.com/npm/npm-registry-couchapp" target="_blank">https://github.com/npm/npm-registry-couchapp</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></li>
<li id="fn:22">CouchDB at the BBC as a fault tolerant, scalable, multi-data center key-value store <a href="http://www.erlang-factory.com/conference/London2009/speakers/endafarrell" target="_blank">http://www.erlang-factory.com/conference/London2009/speakers/endafarrell</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></li>
<li id="fn:23">Email from Elliot Murphy (Canonical) Archived 2011-05-05 at the Wayback Machine to the CouchDB-Devel list <a href="https://mail-archives.apache.org/mod_mbox/couchdb-dev/200910.mbox/%3C4AD53996.3090104@canonical.com%3E" target="_blank">https://mail-archives.apache.org/mod_mbox/couchdb-dev/200910.mbox/%3C4AD53996.3090104@canonical.com%3E</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></li>
<li id="fn:24">Canonical Drops CouchDB From Ubuntu One (Slashdot) <a href="http://linux.slashdot.org/story/11/11/22/171228/canonical-drops-couchdb-from-ubuntu-one" target="_blank">http://linux.slashdot.org/story/11/11/22/171228/canonical-drops-couchdb-from-ubuntu-one</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></li>
<li id="fn:25">"Protogrid - Über uns". <a href="https://protogrid.com/bisc/de/001-about" target="_blank">https://protogrid.com/bisc/de/001-about</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></li>
<li id="fn:26">View Server Documentation Archived 2008-10-20 at the Wayback Machine on wiki.apache.org <a href="https://wiki.apache.org/couchdb/ViewServer" target="_blank">https://wiki.apache.org/couchdb/ViewServer</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></li>
</ol>

Apache CouchDB open-in-new

Apache CouchDB