Chapters 15 &16 Conceptual and Logical Database Design Methodology

Agenda Definition Conceptual database design Relational database - logical design Example

Definition Design methodology –Structured design approach using procedures, techniques, tools and documentation aids Conceptual database design –Constructing an information model, independent from all physical consideration for an enterprise Logical database design –Building an organization database based on a specific data model

Conceptual Database Design Entities Relationships Attributes (simple, no composite, no derived) Attribute domains Primary and candidate key attributes –Minimal set of attributes –Less change –Uniqueness in the future –Fewest characters –Easy to use by users

Relational Database - Logical Design Draw ER model Review –Always binary with1 to many relationship –No complex relationship –No redundant relationship –No recursive relationship –No relationship with attribute(s)

Relational Database - Logical Design Normalize relations –Primary key –Foreign key –BCNF Add constraints –Domain & enterprise –Referential –Entity –legal

Relational Database - Logical Design Review –Organization current & future needs –All user current & future requirements –Normalization (Boyce-Codd) –Relationship (one-to-one or one-to-many) –Redundancy –Constraints User approval Document

Points To Remember Definition Conceptual database design Relational database - logical design Example

Assignment Review chapters 5-6, Read chapters Work on group project –E-R and normalized database due date: