The Data Model Profile is a UML extension that supports the modeling of relational databases in UML. It includes custom extensions for such things as tables, data base schema, table keys, triggers, ...

Object databases are also suited for applications that are not necessarily based on an object model, but use a large number of in-memory indexes that are difficult to store in a relational database.

For the first time in over 20 years, there appear to be cracks forming in the relational model's dominance of the database management systems market. The relational database management system (RDBMS) ...

Multivalue (NF2, non-first normal form systems): complex data structures with schemas similar to relational database model [Here’s more information about Multivalue databases .] ...