Chapter 14 & 15 Conceptual & Logical Database Design Methodology

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Presentation transcript:

Chapter 14 & 15 Conceptual & Logical Database Design Methodology Definition Conceptual database design Relational database - logical design Relational database - physical design Relational database - operation Example

Definition Design methodology Conceptual database design 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 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 Inter & referential Intra 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

Relational Database - Logical Design Mapping logical database to DBMS Base relations Integrity Rules Referential integrity (delete & update) No action Cascade Set null Set default No check

Relational Database - Physical Design Implementing physical representation Analysis transactions File organization Indexes Disk space Security 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: