DBMS > CouchDB vs. etcd vs. Google Cloud Firestore

System Properties Comparison CouchDB vs. etcd vs. Google Cloud Firestore

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Editorial information provided by DB-Engines
Name	CouchDB stands for "Cluster Of Unreliable Commodity Hardware"  Xexclude from comparison	etcd  Xexclude from comparison	Google Cloud Firestore  Xexclude from comparison
Description	A native JSON - document store inspired by Lotus Notes, scalable from globally distributed server-clusters down to mobile phones.	A distributed reliable key-value store	Cloud Firestore is an auto-scaling document database for storing, syncing, and querying data for mobile and web apps. It offers seamless integration with other Firebase and Google Cloud Platform products.
Primary database model	Document store	Key-value store	Document store
Secondary database models	Spatial DBMS using the Geocouch extension
DB-Engines Ranking measures the popularity of database management systems Trend Chart	Score 17.16 Rank #41   Overall #7   Document stores	Score 10.81 Rank #47   Overall #5   Key-value stores	Score 9.25 Rank #52   Overall #10   Document stores
Website	couchdb.apache.org	etcd.io github.com/­etcd-io/­etcd	firebase.google.com/­products/­firestore
Technical documentation	docs.couchdb.org/­en/­stable	etcd.io/­docs github.com/­etcd-io/­etcd/­tree/­master/­Documentation	firebase.google.com/­docs/­firestore
Developer	Apache Software Foundation Apache top-level project, originally developed by Damien Katz, a former Lotus Notes developer		Google
Initial release	2005		2017
Current release	3.2.2, April 2022	3.4, August 2019
License Commercial or Open Source	Open Source Apache version 2	Open Source Apache Version 2.0	commercial
Cloud-based only Only available as a cloud service	no	no	yes
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Implementation language	Erlang	Go
Server operating systems	Android BSD Linux OS X Solaris Windows	FreeBSD Linux Windows experimental	hosted
Data scheme	schema-free	schema-free	schema-free
Typing predefined data types such as float or date	no	no	yes
XML support Some form of processing data in XML format, e.g. support for XML data structures, and/or support for XPath, XQuery or XSLT.	no	no	no
Secondary indexes	yes via views	no	yes
SQL Support of SQL	no	no	no
APIs and other access methods	RESTful HTTP/JSON API	gRPC JSON over HTTP	Android gRPC (using protocol buffers) API iOS JavaScript API RESTful HTTP API
Supported programming languages	C C# ColdFusion Erlang Haskell Java JavaScript Lisp Lua Objective-C OCaml Perl PHP PL/SQL Python Ruby Smalltalk	.Net C C++ Clojure Erlang Go Haskell Java JavaScript (Node.js) Perl PHP Python R Ruby Rust Scala Tcl	Go Java JavaScript JavaScript (Node.js) Objective-C Python
Server-side scripts Stored procedures	View functions in JavaScript	no	yes, Firebase Rules & Cloud Functions
Triggers	yes	yes, watching key changes	yes, with Cloud Functions
Partitioning methods Methods for storing different data on different nodes	Sharding improved architecture with release 2.0		Sharding
Replication methods Methods for redundantly storing data on multiple nodes	Multi-source replication Source-replica replication	Using Raft consensus algorithm to ensure data replication with strong consistency among multiple replicas.	Multi-source replication
MapReduce Offers an API for user-defined Map/Reduce methods	yes	no	Using Cloud Dataflow
Consistency concepts Methods to ensure consistency in a distributed system	Eventual Consistency	Immediate Consistency	Immediate Consistency
Foreign keys Referential integrity	no	no	no
Transaction concepts Support to ensure data integrity after non-atomic manipulations of data	no atomic operations within a single document possible	no	yes
Concurrency Support for concurrent manipulation of data	yes strategy: optimistic locking	yes	yes
Durability Support for making data persistent	yes	yes	yes
In-memory capabilities Is there an option to define some or all structures to be held in-memory only.	no	no
User concepts Access control	Access rights for users can be defined per database	no	Access rights for users, groups and roles based on Google Cloud Identity and Access Management. Security Rules for 3rd party authentication using Firebase Auth.
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More resources
	CouchDB stands for "Cluster Of Unreliable Commodity Hardware"	etcd	Google Cloud Firestore
DB-Engines blog posts	Couchbase climbs up the DB-Engines Ranking, increasing its popularity by 10% every month 2 June 2014, Matthias Gelbmann show all