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DBMS > CouchDB vs. Crux vs. Firebase Realtime Database vs. KairosDB vs. PouchDB

System Properties Comparison CouchDB vs. Crux vs. Firebase Realtime Database vs. KairosDB vs. PouchDB

Editorial information provided by DB-Engines
NameCouchDB infostands for "Cluster Of Unreliable Commodity Hardware"  Xexclude from comparisonCrux  Xexclude from comparisonFirebase Realtime Database  Xexclude from comparisonKairosDB  Xexclude from comparisonPouchDB  Xexclude from comparison
DescriptionA native JSON - document store inspired by Lotus Notes, scalable from globally distributed server-clusters down to mobile phones.Crux is a general purpose database with bitemporal SQL and Datalog and graph queriesCloud-hosted realtime document store. iOS, Android, and JavaScript clients share one Realtime Database instance and automatically receive updates with the newest data.Distributed Time Series DBMS based on Cassandra or H2JavaScript DBMS with an API inspired by CouchDB
Primary database modelDocument storeDocument storeDocument storeTime Series DBMSDocument store
Secondary database modelsSpatial DBMS infousing the Geocouch extension
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score15.97
Rank#39  Overall
#6  Document stores
Score0.04
Rank#331  Overall
#45  Document stores
Score16.91
Rank#38  Overall
#5  Document stores
Score0.71
Rank#204  Overall
#13  Time Series DBMS
Score2.50
Rank#100  Overall
#18  Document stores
Websitecouchdb.apache.orggithub.com/­juxt/­crux
opencrux.com
firebase.google.com/­products/­realtime-databasegithub.com/­kairosdb/­kairosdbpouchdb.com
Technical documentationdocs.couchdb.org/­en/­stableopencrux.com/­reference/­installation.htmlfirebase.google.com/­docs/­databasekairosdb.github.iopouchdb.com/­guides
DeveloperApache Software Foundation infoApache top-level project, originally developed by Damien Katz, a former Lotus Notes developerJuxt Ltd.Google infoacquired by Google 2014Apache Software Foundation
Initial release20052019201220132012
Current release3.1.1 , September 20201.12.1, September 20201.2.2, November 20187.1.1, June 2019
License infoCommercial or Open SourceOpen Source infoApache version 2Open Source infoMIT LicensecommercialOpen Source infoApache 2.0Open Source
Cloud-based only infoOnly available as a cloud servicenonoyesnono
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageErlangClojureJavaJavaScript
Server operating systemsAndroid
BSD
Linux
OS X
Solaris
Windows
All OS with a Java 8 (and higher) VM
Linux
hostedLinux
OS X
Windows
server-less, requires a JavaScript environment (browser, Node.js)
Data schemeschema-freeschema-freeschema-freeschema-freeschema-free
Typing infopredefined data types such as float or datenoyes, extensible-data-notation formatyesyesno
XML support infoSome form of processing data in XML format, e.g. support for XML data structures, and/or support for XPath, XQuery or XSLT.nonononono
Secondary indexesyes infovia viewsyesyesnoyes infovia views
SQL infoSupport of SQLnolimited SQL, making use of Apache Calcitenonono
APIs and other access methodsRESTful HTTP/JSON APIHTTP REST
JDBC
Android
iOS
JavaScript API
RESTful HTTP API
Graphite protocol
HTTP REST
Telnet API
HTTP REST infoonly for PouchDB Server
JavaScript API
Supported programming languagesC
C#
ColdFusion
Erlang
Haskell
Java
JavaScript
Lisp
Lua
Objective-C
OCaml
Perl
PHP
PL/SQL
Python
Ruby
Smalltalk
Clojure
Java
Java
JavaScript
Objective-C
Java
JavaScript infoNode.js
PHP
Python
JavaScript
Server-side scripts infoStored proceduresView functions in JavaScriptnolimited functionality with using 'rules'noView functions in JavaScript
TriggersyesnoCallbacks are triggered when data changesnoyes
Partitioning methods infoMethods for storing different data on different nodesSharding infoimproved architecture with release 2.0noneSharding infobased on CassandraSharding infowith a proxy-based framework, named couchdb-lounge
Replication methods infoMethods for redundantly storing data on multiple nodesMulti-source replication
Source-replica replication
yes, each node contains all dataselectable replication factor infobased on CassandraMulti-source replication infoalso with CouchDB databases
Source-replica replication infoalso with CouchDB databases
MapReduce infoOffers an API for user-defined Map/Reduce methodsyesnononoyes
Consistency concepts infoMethods to ensure consistency in a distributed systemEventual ConsistencyEventual Consistency infoif the client is offline
Immediate Consistency infoif the client is online
Eventual Consistency infobased on Cassandra
Immediate Consistency infobased on Cassandra
Eventual Consistency
Foreign keys infoReferential integritynonononono
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of datano infoatomic operations within a single document possibleACIDyesnono
Concurrency infoSupport for concurrent manipulation of datayes infostrategy: optimistic lockingyesyesyes
Durability infoSupport for making data persistentyesyes, flexibel persistency by using storage technologies like Apache Kafka, RocksDB or LMDByesyesyes infoby using IndexedDB, WebSQL or LevelDB as backend
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.nonoyes
User concepts infoAccess controlAccess rights for users can be defined per databaseyes, based on authentication and database rulessimple password-based access controlno

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More resources
CouchDB infostands for "Cluster Of Unreliable Commodity Hardware"CruxFirebase Realtime DatabaseKairosDBPouchDB
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