DBMS > Datomic vs. PostgreSQL vs. Trafodion
System Properties Comparison Datomic vs. PostgreSQL vs. Trafodion
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|Editorial information provided by DB-Engines|
|Name||Datomic Xexclude from comparison||PostgreSQL Xexclude from comparison||Trafodion Xexclude from comparison|
|Apache Trafodion has been retired in 2021. Therefore it is excluded from the DB-Engines Ranking.|
|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||Transactional SQL-on-Hadoop DBMS|
|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.||Relational DBMS|
|Secondary database models||Document store|
Graph DBMS with Apache Age
Vector DBMS with pgvector extension
|Developer||Cognitect||PostgreSQL Global Development Group www.postgresql.org/developer||Apache Software Foundation, originally developed by HP|
|Initial release||2012||1989 1989: Postgres, 1996: PostgreSQL||2014|
|Current release||1.0.6735, June 2023||16.0, September 2023||2.3.0, February 2019|
|License Commercial or Open Source||commercial limited edition free||Open Source BSD||Open Source Apache 2.0|
|Cloud-based only Only available as a cloud service||no||no||no|
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|Aiven for PostgreSQL: Fully managed and hosted PostgreSQL® with 70+ extensions and orchestration tooling included.|
|Implementation language||Java, Clojure||C||C++, Java|
|Server operating systems||All OS with a Java VM||FreeBSD|
|Typing predefined data types such as float or date||yes||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.||no|
|SQL Support of SQL||no||yes standard with numerous extensions||yes|
|APIs and other access methods||RESTful HTTP API||ADO.NET|
native C library
streaming API for large objects
|Supported programming languages||Clojure|
|All languages supporting JDBC/ODBC/ADO.Net|
|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.||Java Stored Procedures|
|Triggers||By using transaction functions||yes||no|
|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||Sharding|
|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||yes, via HBase|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||no||yes via user defined functions and HBase|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate 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||ACID||ACID||ACID|
|Concurrency Support for concurrent manipulation of data||yes||yes||yes|
|Durability Support for making data persistent||yes using external storage systems (e.g. Cassandra, DynamoDB, PostgreSQL, Couchbase and others)||yes||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||no|
|User concepts Access control||no||fine grained access rights according to SQL-standard||fine grained access rights according to SQL-standard|
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|Related products and services|
|3rd parties||Navicat for PostgreSQL is an easy-to-use graphical tool for PostgreSQL database development.|
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Redgate webinars: A series of key topics for new PostgreSQL users.
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Aiven for PostgreSQL: The familiar open source PostgreSQL® that you know and love, with no proprietary features or add-ons that will lock you in.
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|DB-Engines blog posts|
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|Conferences and events|
PostgreSQL 101: An introduction to Multi-Version Concurrency Control and Vacuum
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