DBMS > 4D vs. PostgreSQL vs. VelocityDB
System Properties Comparison 4D vs. PostgreSQL vs. VelocityDB
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|Editorial information provided by DB-Engines|
|Name||4D former name: 4th Dimension Xexclude from comparison||PostgreSQL Xexclude from comparison||VelocityDB Xexclude from comparison|
|Description||Application development environment with integrated database management system||Widely used open source RDBMS Developed as objectoriented DBMS (Postgres), gradually enhanced with 'standards' like SQL||A .NET Object Database that can be embedded/distributed and extended to a graph data model (VelocityGraph)|
|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.||Graph DBMS|
Object oriented DBMS
|Secondary database models||Document store|
|Developer||4D, Inc||PostgreSQL Global Development Group www.postgresql.org/developer||VelocityDB Inc|
|Initial release||1984||1989 1989: Postgres, 1996: PostgreSQL||2011|
|Current release||v18 R5, January 2021||13.2 , February 2021||7.x|
|License Commercial or Open Source||commercial||Open Source BSD||commercial|
|Cloud-based only Only available as a cloud service||no||no||no|
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|Server operating systems||OS X|
|Any that supports .NET|
|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.||yes||yes specific XML-type available, but no XML query functionality.||no|
|SQL Support of SQL||yes close to SQL 92||yes standard with numerous extensions||no|
|APIs and other access methods||ODBC|
RESTful HTTP API by using 4D Mobile
native C library
streaming API for large objects
|Supported programming languages||4D proprietary IDE|
|Server-side scripts Stored procedures||yes||user defined functions realized in proprietary language PL/pgSQL or with common languages like Perl, Python, Tcl etc.||no|
|Triggers||yes||yes||Callbacks are triggered when data changes|
|Partitioning methods Methods for storing different data on different nodes||none||partitioning by range, list and (since PostgreSQL 11) by hash||Sharding|
|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||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency||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||ACID||ACID|
|Concurrency Support for concurrent manipulation of data||yes||yes||yes|
|Durability Support for making data persistent||yes||yes||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||no||no||yes|
|User concepts Access control||Users and groups||fine grained access rights according to SQL-standard||Based on Windows Authentication|
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|4D former name: 4th Dimension||PostgreSQL||VelocityDB|
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