DBMS > Alibaba Cloud AnalyticDB for PostgreSQL vs. CouchDB vs. OpenQM
System Properties Comparison Alibaba Cloud AnalyticDB for PostgreSQL vs. CouchDB vs. OpenQM
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|Editorial information provided by DB-Engines|
|Name||Alibaba Cloud AnalyticDB for PostgreSQL former name was HybridDB Xexclude from comparison||CouchDB stands for "Cluster Of Unreliable Commodity Hardware" Xexclude from comparison||OpenQM also called QM Xexclude from comparison|
|Description||An online MPP (Massively Parallel Processing) data warehousing service based on Greenplum||A native JSON - document store inspired by Lotus Notes, scalable from globally distributed server-clusters down to mobile phones.||QpenQM is a high-performance, self-tuning, multi-value DBMS|
|Primary database model||Relational DBMS||Document store||Multivalue DBMS|
|Secondary database models||Spatial DBMS using the Geocouch extension|
|Developer||Alibaba / Pivotal Software Inc. / PostgreSQL Global Development Group||Apache Software Foundation Apache top-level project, originally developed by Damien Katz, a former Lotus Notes developer||Martin Phillips|
|Current release||3.3.1, January 2023||3.4-12|
|License Commercial or Open Source||commercial||Open Source Apache version 2||Open Source GPLv2, extended commercial license available|
|Cloud-based only Only available as a cloud service||yes||no||no|
|DBaaS offerings (sponsored links) Database as a Service|
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|Server operating systems||hosted||Android|
|Data scheme||yes||schema-free||yes with some exceptions|
|Typing predefined data types such as float or date||yes||no|
|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.||yes||no||yes|
|Secondary indexes||yes||yes via views||yes|
|SQL Support of SQL||yes||no||no|
|APIs and other access methods||JDBC|
|RESTful HTTP/JSON API|
|Supported programming languages||C|
|Partitioning methods Methods for storing different data on different nodes||Sharding Implicit feature of the cloud service||Sharding improved architecture with release 2.0||yes|
|Replication methods Methods for redundantly storing data on multiple nodes||yes Implicit feature of the cloud service||Multi-source replication|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||yes||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency||Eventual Consistency||Immediate Consistency|
|Foreign keys Referential integrity||yes||no||no|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||ACID||no atomic operations within a single document possible||ACID|
|Concurrency Support for concurrent manipulation of data||yes||yes strategy: optimistic locking||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||fine grained access rights according to SQL-standard||Access rights for users can be defined per database||Access rights can be defined down to the item level|
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|Alibaba Cloud AnalyticDB for PostgreSQL former name was HybridDB||CouchDB stands for "Cluster Of Unreliable Commodity Hardware"||OpenQM also called QM|
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