DBMS > Datomic vs. PostgreSQL
System Properties Comparison Datomic vs. PostgreSQL
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|Editorial information provided by DB-Engines|
|Name||Datomic Xexclude from comparison||PostgreSQL Xexclude from comparison|
|Description||Datomic builds on immutable values, supports point-in-time queries and uses 3rd party systems for durability||Widely used open source RDBMS Developed as objectoriented DBMS (Postgres), gradually enhanced with 'standards' like SQL|
|Primary database model||Relational DBMS||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||Document store|
|Developer||Cognitect||PostgreSQL Global Development Group www.postgresql.org/developer|
|Initial release||2012||1989 1989: Postgres, 1996: PostgreSQL|
|Current release||1.0.6362, January 2022||14.4, June 2022|
|License Commercial or Open Source||commercial limited edition free||Open Source BSD|
|Cloud-based only Only available as a cloud service||no||no|
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|Implementation language||Java, Clojure||C|
|Server operating systems||All OS with a Java VM||FreeBSD|
|Typing predefined data types such as float or date||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.|
|SQL Support of SQL||no||yes standard with numerous extensions|
|APIs and other access methods||RESTful HTTP API||ADO.NET|
native C library
streaming API for large objects
|Supported programming languages||Clojure|
|Server-side scripts Stored procedures||yes Transaction Functions||user defined functions realized in proprietary language PL/pgSQL or with common languages like Perl, Python, Tcl etc.|
|Triggers||By using transaction functions||yes|
|Partitioning methods Methods for storing different data on different nodes||none But extensive use of caching in the application peers||partitioning by range, list and (since PostgreSQL 11) by hash|
|Replication methods Methods for redundantly storing data on multiple nodes||none But extensive use of caching in the application peers||Source-replica replication other methods possible by using 3rd party extensions|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency||Immediate Consistency|
|Foreign keys Referential integrity||no||yes|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||ACID||ACID|
|Concurrency Support for concurrent manipulation of data||yes||yes|
|Durability Support for making data persistent||yes using external storage systems (e.g. Cassandra, DynamoDB, PostgreSQL, Couchbase and others)||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||yes recommended only for testing and development||no|
|User concepts Access control||no||fine grained access rights according to SQL-standard|
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