Post-relational DB refers to databases intended to support an alternative logical data model to the transaction processing oriented, 3rd Normal form, relational model. These databases were developed after the initial relational databases. When data is modeled and stored in a format that differs substantially from the relational model of relations and primary and foreign keys, then the database can be characterized as a post-relational database. Examples include multidimensional databases, column databases, object-relational databases, No SQL, flat file databases and others.
Related Terms: database, RDBMS