Data Models

Captured Notes from Session #2 - Data Models

Hierarchical Data Models

• Tree like structures
• Used in Windows Registry
• Frequent Use (IMS)
• DL / 1 Programming language for IMS
• Difficult to reorganize

Graph / Network Model

• Organize collection of records in form of directed graph
• 3 way relationships can't be maintained

ER Model

• Defined in terms of Entity, Relationships
• Never Caught on Physical Model

Object Oriented Database model

• Difficult mapping programming objects to database objects

Relational Model

• Better physical data independence
• Better logical independence
• Won because of linear algebra

Happy Learning!!!