DBMS > CouchDB vs. MySQL vs. Oracle Rdb
System Properties Comparison CouchDB vs. MySQL vs. Oracle Rdb
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|Editorial information provided by DB-Engines|
|Name||CouchDB stands for "Cluster Of Unreliable Commodity Hardware" Xexclude from comparison||MySQL Xexclude from comparison||Oracle Rdb Xexclude from comparison|
|Description||A native JSON - document store inspired by Lotus Notes, scalable from globally distributed server-clusters down to mobile phones.||Widely used open source RDBMS|
|Primary database model||Document store||Relational DBMS Key/Value like access via memcached API||Relational DBMS|
|Secondary database models||Spatial DBMS using the Geocouch extension||Document store|
|Developer||Apache Software Foundation Apache top-level project, originally developed by Damien Katz, a former Lotus Notes developer||Oracle since 2010, originally MySQL AB, then Sun||Oracle, originally developed by Digital Equipment Corporation (DEC)|
|Current release||3.3.2, April 2023||8.1.0, July 2023||220.127.116.11, 2021|
|License Commercial or Open Source||Open Source Apache version 2||Open Source GPL version 2. Commercial licenses with extended functionallity are available||commercial|
|Cloud-based only Only available as a cloud service||no||no||no|
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|Implementation language||Erlang||C and C++|
|Server operating systems||Android|
|HP Open VMS|
|Data scheme||schema-free||yes||Flexible Schema (defined schema, partial schema, schema free)|
|Typing predefined data types such as float or date||no||yes||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||yes||no|
|Secondary indexes||yes via views||yes||yes|
|SQL Support of SQL||no||yes with proprietary extensions||yes|
|APIs and other access methods||RESTful HTTP/JSON API||ADO.NET|
Proprietary native API
|Supported programming languages||C|
|Partitioning methods Methods for storing different data on different nodes||Sharding improved architecture with release 2.0||horizontal partitioning, sharding with MySQL Cluster or MySQL Fabric|
|Replication methods Methods for redundantly storing data on multiple nodes||Multi-source replication|
|MapReduce Offers an API for user-defined Map/Reduce methods||yes||no||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Eventual Consistency||Immediate Consistency||Immediate Consistency|
|Foreign keys Referential integrity||no||yes not for MyISAM storage engine||yes|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||no atomic operations within a single document possible||ACID not for MyISAM storage engine||yes, on a single node|
|Concurrency Support for concurrent manipulation of data||yes strategy: optimistic locking||yes table locks or row locks depending on storage engine||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||yes||no|
|User concepts Access control||Access rights for users can be defined per database||Users with fine-grained authorization concept no user groups or roles|
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|CouchDB stands for "Cluster Of Unreliable Commodity Hardware"||MySQL||Oracle Rdb|
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