DBMS > KeyDB vs. PostgreSQL
System Properties Comparison KeyDB vs. PostgreSQL
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|Editorial information provided by DB-Engines|
|Name||KeyDB Xexclude from comparison||PostgreSQL Xexclude from comparison|
|Description||An ultra-fast, open source Key-value store fully compatible with Redis API, modules, and protocols||Widely used open source RDBMS Developed as objectoriented DBMS (Postgres), gradually enhanced with 'standards' like SQL|
|Primary database model||Key-value 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||Document store|
|Developer||EQ Alpha Technology Ltd.||PostgreSQL Global Development Group www.postgresql.org/developer|
|Initial release||2019||1989 1989: Postgres, 1996: PostgreSQL|
|Current release||14.4, June 2022|
|License Commercial or Open Source||Open Source BSD-3||Open Source BSD|
|Cloud-based only Only available as a cloud service||no||no|
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|Server operating systems||Linux||FreeBSD|
|Typing predefined data types such as float or date||partial Supported data types are strings, hashes, lists, sets and sorted sets, bit arrays, hyperloglogs and geospatial indexes||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.|
|Secondary indexes||yes by using the Redis Search module||yes|
|SQL Support of SQL||no||yes standard with numerous extensions|
|APIs and other access methods||Proprietary protocol RESP - REdis Serialization Protoco||ADO.NET|
native C library
streaming API for large objects
|Supported programming languages||C|
|Server-side scripts Stored procedures||Lua||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||Sharding||partitioning by range, list and (since PostgreSQL 11) by hash|
|Replication methods Methods for redundantly storing data on multiple nodes||Multi-source replication|
|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||Eventual Consistency|
Strong eventual consistency with CRDTs
|Foreign keys Referential integrity||no||yes|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||Optimistic locking, atomic execution of commands blocks and scripts||ACID|
|Concurrency Support for concurrent manipulation of data||yes||yes|
|Durability Support for making data persistent||yes Configurable mechanisms for persistency via snapshots and/or operations logs||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||simple password-based access control and ACL||fine grained access rights according to SQL-standard|
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