DBMS > CouchDB vs. PostgreSQL vs. SAP SQL Anywhere
System Properties Comparison CouchDB vs. PostgreSQL vs. SAP SQL Anywhere
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|Editorial information provided by DB-Engines|
|Name||CouchDB stands for "Cluster Of Unreliable Commodity Hardware" Xexclude from comparison||PostgreSQL Xexclude from comparison||SAP SQL Anywhere formerly called Adaptive Server Anywhere 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 Developed as objectoriented DBMS (Postgres), gradually enhanced with 'standards' like SQL||RDBMS database and synchronization technologies for server, desktop, remote office, and mobile environments|
|Primary database model||Document store||Relational DBMS with object oriented extensions, e.g.: user defined types/functions and inheritance. Handling of key/value pairs with hstore module.||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||PostgreSQL Global Development Group www.postgresql.org/developer||SAP formerly Sybase|
|Initial release||2005||1989 1989: Postgres, 1996: PostgreSQL||1992|
|Current release||3.1.1 , September 2020||13.2 , February 2021||17, July 2015|
|License Commercial or Open Source||Open Source Apache version 2||Open Source BSD||commercial|
|Cloud-based only Only available as a cloud service||no||no||no|
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|Server operating systems||Android|
|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 specific XML-type available, but no XML query functionality.||yes|
|Secondary indexes||yes via views||yes||yes|
|SQL Support of SQL||no||yes standard with numerous extensions||yes|
|APIs and other access methods||RESTful HTTP/JSON API||ADO.NET|
native C library
streaming API for large objects
|Supported programming languages||C|
|Partitioning methods Methods for storing different data on different nodes||Sharding improved architecture with release 2.0||partitioning by range, list and (since PostgreSQL 11) by hash||none|
|Replication methods Methods for redundantly storing data on multiple nodes||Multi-source replication|
|Source-replica replication other methods possible by using 3rd party extensions||Source-replica replication Database mirroring|
|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||yes|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||no atomic operations within a single document possible||ACID||ACID|
|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||yes|
|User concepts Access control||Access rights for users can be defined per database||fine grained access rights according to SQL-standard||fine grained access rights according to SQL-standard|
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|CouchDB stands for "Cluster Of Unreliable Commodity Hardware"||PostgreSQL||SAP SQL Anywhere formerly called Adaptive Server Anywhere|
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