![Chapter 2
3
Figure 2-1 Segment from enterprise data model (Pine
Valley Furniture Company) [simplified E-R diagram,
repeat of figure 1.3]
Enterprise data model describes
the high-level entities in an
organization and the
relationship between these
entities](https://image.slidesharecdn.com/dblc-130930124144-phpapp02/85/Dblc-3-320.jpg)
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- 2. Chapter 2 How problems associated with the software development led to the software crisis. About the relationship between the information systems lifecycle and the database system development lifecycle. ©Pearson Education 2009 2
- 3. Chapter 2 3 Figure 2-1 Segment from enterprise data model (Pine Valley Furniture Company) [simplified E-R diagram, repeat of figure 1.3] Enterprise data model describes the high-level entities in an organization and the relationship between these entities
- 4. Chapter 2 4 Maintenance Purpose --preliminary understanding Deliverable –request for project Database activity – enterprise modeling Project Identification and Selection Project Initiation and Planning Analysis Physical Design Implementation Maintenance Logical Design Project Identification and Selection
- 5. Chapter 2 5 Purpose – state business situation and solution Deliverable – request for analysis Database activity – conceptual data modeling Project Identification and Selection Project Initiation and Planning Analysis Physical Design Implementation Maintenance Logical Design Project Initiation and Planning
- 6. Chapter 2 6 Purpose – thorough analysis Deliverable – functional system specifications Database activity – conceptual data modeling Project Identification and Selection Project Initiation and Planning Analysis Physical Design Implementation Maintenance Logical Design Analysis
- 7. Chapter 2 7 Maintenance Purpose – information requirements structure Deliverable – detailed design specifications Database activity – logical database design Project Identification and Selection Project Initiation and Planning Analysis Physical Design Implementation Maintenance Logical DesignLogical Design
- 8. Chapter 2 8 Purpose – develop technology specs Deliverable – program/data structures, technology purchases, organization redesigns Database activity – physical database design Project Identification and Selection Project Initiation and Planning Analysis Physical Design Implementation Maintenance Logical Design Physical Design
- 9. Chapter 2 9 Purpose – programming, testing, training, installation, documenting Deliverable – operational programs, documentation, training materials Database activity – database implementation Project Identification and Selection Project Initiation and Planning Analysis Physical Design Implementation Maintenance Logical Design Implementation
- 10. Chapter 2 10 Purpose – monitor, repair, enhance Deliverable – periodic audits Database activity – database maintenance Project Identification and Selection Project Initiation and Planning Analysis Physical Design Implementation Maintenance Logical Design Maintenance
- 11. Chapter 2 11
- 12. Chapter 2 Database Life Cycle (DBLC) Database Initial Study Database Design Implementation and Loading Testing and Evaluation Operation Maintenance and Evaluation • Traces the history of the creation of a database • Split into 6 phases
- 13. Chapter 2 Database Life Cycle (DBLC) Database Initial Study Database Design Implementation and Loading Testing and Evaluation Operation Maintenance and Evaluation • Analyze company situation • Define Problem and Constraints • Define Objectives • Define Scope and Boundaries
- 14. Chapter 2 Database Life Cycle (DBLC) Database Initial Study Database Design Implementation and Loading Testing and Evaluation Operation Maintenance and Evaluation • Conceptual Design • ER-Diagram / Normalization • DBMS Software Selection • Create the Logical Design • Create the Physical Design
- 15. Chapter 2 Database Life Cycle (DBLC) Database Initial Study Database Design Implementation and Loading Testing and Evaluation Operation Maintenance and Evaluation • Install the selected DBMS • Create the databases • Load the data / Convert from Old System
- 16. Chapter 2 Database Life Cycle (DBLC) Database Initial Study Database Design Implementation and Loading Testing and Evaluation Operation Maintenance and Evaluation • Test the Database • Fine-Tune the Database • Evaluate the Database and its Application Programs
- 17. Chapter 2 Database Life Cycle (DBLC) Database Initial Study Database Design Implementation and Loading Testing and Evaluation Operation Maintenance and Evaluation • Produce the required information flow • Alternate form of testing • OLAP & OLTP
- 18. Chapter 2 Database Life Cycle (DBLC) Database Initial Study Database Design Implementation and Loading Testing and Evaluation Operation Maintenance and Evaluation • Changes to the System (from operation, bugs, business changes) • Enhancements
- 19. Chapter 2 19
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- 24. Chapter 2 Systems analysts Database analysts Users Programmers Database/data administrators Systems programmers, network administrators, testers, technical writers 24
- 25. Chapter 2 25 Figure 2-8a Gantt Chart Shows time estimates of tasks
- 26. Chapter 2 26 Figure 2-8b PERT chart Shows dependencies between tasks
- 27. Chapter 2 Physical Schema Conceptual Schema External Schema User Views Subsets of Conceptual Schema Can be determined from business-function/data entity matrices DBA determines schema for different users 27
- 28. Chapter 2 28 Different people have different views of the database…these are the external schema The internal schema is the underlying design and implementation
- 29. Chapter 2 29 Figure 2-11 Three-tiered client/server database architecture
- 30. Chapter 2 30 Preliminary data model (Figure 2-12)
- 31. Chapter 2 31