chapters 15 &16 conceptual and logical database design methodology
TRANSCRIPT
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, 11-16
• Read chapters 17-18
• Work on group project– E-R and normalized database due date: