DBMS > Microsoft Azure Cosmos DB vs. PostgreSQL
System Properties Comparison Microsoft Azure Cosmos DB vs. PostgreSQL
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|Editorial information provided by DB-Engines|
|Name||Microsoft Azure Cosmos DB former name was Azure DocumentDB Xexclude from comparison||PostgreSQL Xexclude from comparison|
|Description||Globally distributed, horizontally scalable, multi-model database service||Widely used open source RDBMS Developed as objectoriented DBMS (Postgres), gradually enhanced with 'standards' like SQL|
|Primary database model||Document store|
Wide column store
|Relational DBMS with object oriented extensions, e.g.: user defined types/functions and inheritance. Handling of key/value pairs with hstore module.|
|Secondary database models||Spatial DBMS||Document store|
|Developer||Microsoft||PostgreSQL Global Development Group www.postgresql.org/developer|
|Initial release||2014||1989 1989: Postgres, 1996: PostgreSQL|
|Current release||14.4, June 2022|
|License Commercial or Open Source||commercial||Open Source BSD|
|Cloud-based only Only available as a cloud service||yes||no|
|DBaaS offerings (sponsored links) Database as a Service|
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|Server operating systems||hosted||FreeBSD|
|Typing predefined data types such as float or date||yes JSON types||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.||yes specific XML-type available, but no XML query functionality.|
|Secondary indexes||yes All properties auto-indexed by default||yes|
|SQL Support of SQL||SQL-like query language||yes standard with numerous extensions|
|APIs and other access methods||DocumentDB API|
Graph API (Gremlin)
RESTful HTTP API
native C library
streaming API for large objects
|Supported programming languages||.Net|
MongoDB client drivers written for various programming languages
|Partitioning methods Methods for storing different data on different nodes||Sharding Implicit feature of the cloud service||partitioning by range, list and (since PostgreSQL 11) by hash|
|Replication methods Methods for redundantly storing data on multiple nodes||yes Implicit feature of the cloud service||Source-replica replication other methods possible by using 3rd party extensions|
|MapReduce Offers an API for user-defined Map/Reduce methods||with Hadoop integration Integration with Hadoop/HDInsight on Azure*||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Bounded Staleness|
Immediate Consistency Consistency level configurable on request level
|Foreign keys Referential integrity||no||yes|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||Multi-item ACID transactions with snapshot isolation within a partition||ACID|
|Concurrency Support for concurrent manipulation of data||yes||yes|
|Durability Support for making data persistent||yes||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||no|
|User concepts Access control||Access rights can be defined down to the item level||fine grained access rights according to SQL-standard|
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|Microsoft Azure Cosmos DB former name was Azure DocumentDB||PostgreSQL|
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