ORDBMS stands for Object-Relational Database Management System.
Each of those two models has their strengths and weaknesses. By combining the two models, a DBMS can take advantage of various strengths from each model.
Examples of ORDBMSs include:
- PostgreSQL. Open source ORDBMS developed by the PostgreSQL Global Development Group.
- Oracle Database by Oracle Corporation.
- Informix by IBM
- SQL Server by Microsoft
- Greenplum Database by Pivotal Software
Note that, some of these systems can also be classified as simply RDBMS. The number of ORDBMS attributes varies between these systems, however, their vendors all claim that they are ORDBMS.