Object oriented database

Question

I don\'t know if this is the right title for this question. Anyway, recently I have heard about that you could make life easier when creating database. By in which you use objec

Answer 1

Object DB

• High performance
• Faster as no joins required
• Inherent versioning mechanism
• Navigational interface for operations (like graph traversal)
• Object Query Language retrieve objects declaratively
• complex data types
• object identity ie. equals() in which object identity is independent of value and updates
• facilitates object sharing
• classes and hierarchies (inheritance and encapsulation)
• support for relationships
• integrated with a persistence language like ODL
• support for atomicity
• support for nested relationships
• semantic modelling

Cons

• No mathematical foundation as RDB (refer Codd)
• cons of object orientation
• persistence difficult for complex structures, some data must be transient

Object-Relational databases (You might have seen UDTs!)

• support for complex data types like collection, multisets etc
• object oriented data modelling
• extended SQL and rich types
• support for UDT inhertance
• powerful query language

Different approaches (OO, Relational DB or OODB) may be necessary for different applications

References

OODMS manifesto

ODMG

The Object-Oriented Database System Manifesto

Object Oriented Database Systems

Object Relational Databases in DBMS

Completeness Criteria for Object-Relational Database Systems

Comparisons

http://en.wikipedia.org/wiki/Comparison_of_object_database_management_systems

http://en.wikipedia.org/wiki/Comparison_of_object-relational_database_management_systems