Download Chapter 7 & 8 Logical & Physical Database Design

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Transcript 
Chapter 14 & 15
Conceptual & Logical Database Design
Methodology
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Definition
Conceptual database design
Relational database - logical design
Relational database - physical design
Relational database - operation
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
• Physical database design
– Implementing a database using specific data storage
structure(s) and access methods
Conceptual Database Design
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Entities
Relationships
Attributes (simple, no composite, no derived)
Attribute domains
Primary and candidate key attributes
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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
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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
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Domain & enterprise
Inter & referential
Intra
Entity
legal
Relational Database - Logical Design
• Review
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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
Relational Database - Logical Design
• Mapping logical database to DBMS
– Base relations
– Integrity Rules
– Referential integrity (delete & update)
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No action
Cascade
Set null
Set default
No check
Relational Database - Physical Design
• Implementing physical representation
– Analysis transactions
– File organization
• Indexes
• Disk space
• Security
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Policy & procedure
User view
Access rules
Tansmission
Relational Database - Operation
• Monitoring & tuning
– User requirements
– Organization requirements
– Performance
Assignment
• Review chapters 5-6, 11-15, 24-26
• Read chapters 16-17
• Work on group project
– Normalized database due date:
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