DBMS > ClickHouse vs. PostgreSQL
System Properties Comparison ClickHouse vs. PostgreSQL
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|Editorial information provided by DB-Engines|
|Name||ClickHouse Xexclude from comparison||PostgreSQL Xexclude from comparison|
|Description||Column-oriented Relational DBMS powering Yandex||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||Time Series DBMS||Document store|
|Developer||Clickhouse Inc.||PostgreSQL Global Development Group www.postgresql.org/developer|
|Initial release||2016||1989 1989: Postgres, 1996: PostgreSQL|
|Current release||v18.104.22.168-stable, May 2022||14.4, June 2022|
|License Commercial or Open Source||Open Source Apache 2.0||Open Source BSD|
|Cloud-based only Only available as a cloud service||no||no|
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|Server operating systems||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||Close to ANSI SQL||yes standard with numerous extensions|
|APIs and other access methods||HTTP REST|
native C library
streaming API for large objects
|Supported programming languages||C# 3rd party library|
Elixir 3rd party library
Go 3rd party library
Java 3rd party library
Kotlin 3rd party library
Nim 3rd party library
Perl 3rd party library
PHP 3rd party library
Python 3rd party library
R 3rd party library
Ruby 3rd party library
Scala 3rd party library
|Server-side scripts Stored procedures||no||user defined functions realized in proprietary language PL/pgSQL or with common languages like Perl, Python, Tcl etc.|
|Partitioning methods Methods for storing different data on different nodes||partitioning by range, list and (since PostgreSQL 11) by hash|
|Replication methods Methods for redundantly storing data on multiple nodes||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||no||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.||yes||no|
|User concepts Access control||Access rights for users and roles||fine grained access rights according to SQL-standard|
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