IST 318 Database Administration Lecture 5 Database Design

Topics Normalization From Logical Model to Physical Database Indexes View

Normalization Normalization is the process of identifying the one best place where each fact belongs Benefits Minimize redundancy Optimize DB structure By placing data members into the appropriate groupings A normalized (logical) data model can be translated into a correctly organized physical DB

Normalization Non-atomic Data items Duplicated; Duplicated; Variable items The road to normalization is decomposition

Normalization – first normal form form eliminates repeating groups and nonatomic data from an entity

Normalization – second normal form Second normal form ensures that all the attributes of each entity are dependent

Normalization – third normal form Third normal form ensures that no relationships between attributes exist within an entity

ER Diagram – the STUDENT data model