DBMS > Oracle vs. PostgreSQL vs. XTDB
System Properties Comparison Oracle vs. PostgreSQL vs. XTDB
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|Editorial information provided by DB-Engines|
|Name||Oracle Xexclude from comparison||PostgreSQL Xexclude from comparison||XTDB formerly named Crux Xexclude from comparison|
|Description||Widely used RDBMS||Widely used open source RDBMS Developed as objectoriented DBMS (Postgres), gradually enhanced with 'standards' like SQL||A general purpose database with bitemporal SQL and Datalog and graph queries|
|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.||Document store|
|Secondary database models||Document store|
Graph DBMS with Oracle Spatial and Graph
RDF store with Oracle Spatial and Graph
Spatial DBMS with Oracle Spatial and Graph
Graph DBMS with Apache Age
Vector DBMS with pgvector extension
|Developer||Oracle||PostgreSQL Global Development Group www.postgresql.org/developer||Juxt Ltd.|
|Initial release||1980||1989 1989: Postgres, 1996: PostgreSQL||2019|
|Current release||21c, January 2021||16.1, November 2023||1.19, September 2021|
|License Commercial or Open Source||commercial restricted free version is available||Open Source BSD||Open Source MIT License|
|Cloud-based only Only available as a cloud service||no||no||no|
|DBaaS offerings (sponsored links) Database as a Service|
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|Aiven for PostgreSQL: Fully managed PostgreSQL for developers with 70+ extensions and flexible orchestration tools.|
|Implementation language||C and C++||C||Clojure|
|Server operating systems||AIX|
|All OS with a Java 8 (and higher) VM|
|Data scheme||yes Schemaless in JSON and XML columns||yes||schema-free|
|Typing predefined data types such as float or date||yes||yes||yes, extensible-data-notation format|
|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||yes specific XML-type available, but no XML query functionality.||no|
|SQL Support of SQL||yes with proprietary extensions||yes standard with numerous extensions||limited SQL, making use of Apache Calcite|
|APIs and other access methods||JDBC|
Oracle Call Interface (OCI)
native C library
streaming API for large objects
|Supported programming languages||C|
|Server-side scripts Stored procedures||PL/SQL also stored procedures in Java possible||user defined functions realized in proprietary language PL/pgSQL or with common languages like Perl, Python, Tcl etc.||no|
|Partitioning methods Methods for storing different data on different nodes||Sharding, horizontal partitioning||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||yes, each node contains all data|
|MapReduce Offers an API for user-defined Map/Reduce methods||no can be realized in PL/SQL||no||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency||Immediate Consistency|
|Foreign keys Referential integrity||yes||yes||no|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||ACID isolation level can be parameterized||ACID||ACID|
|Concurrency Support for concurrent manipulation of data||yes||yes||yes|
|Durability Support for making data persistent||yes||yes||yes, flexibel persistency by using storage technologies like Apache Kafka, RocksDB or LMDB|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||yes Version 12c introduced the new option 'Oracle Database In-Memory'||no|
|User concepts Access control||fine grained access rights according to SQL-standard||fine grained access rights according to SQL-standard|
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|3rd parties||Navicat for Oracle improves the efficiency and productivity of Oracle developers and administrators with a streamlined working environment.|
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|Oracle||PostgreSQL||XTDB formerly named Crux|
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