پاورپوینت Database Concepts
27 اسلاید
Enterprise Data Model
•First step in database development
•Specifies scope and general content
•Overall picture of organizational data at high level of abstraction
•Entity-relationship diagram
•Descriptions of entity types
•Relationships between entities
•Business rules
Segment from enterprise data model (Pine Valley Furniture Company) [simplified E-R diagram]
Information Systems Architecture (ISA)
•Conceptual blueprint for organization’s desired information systems structure
•Consists of:
–Data (e.g. Enterprise Data Model – simplified ER Diagram)
–Processes – data flow diagrams, process decomposition, etc.
–Data Network – topology diagram
–People – people management using project management tools (Gantt charts, etc.)
–Events and points in time (when processes are performed)
–Reasons for events and rules (e.g. decision tables)
پاورپوینت Database Concepts