is 4420 database fundamentals chapter 2 database development process leon chen l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
IS 4420 Database Fundamentals Chapter 2: Database Development Process Leon Chen PowerPoint Presentation
Download Presentation
IS 4420 Database Fundamentals Chapter 2: Database Development Process Leon Chen

Loading in 2 Seconds...

play fullscreen
1 / 28

IS 4420 Database Fundamentals Chapter 2: Database Development Process Leon Chen - PowerPoint PPT Presentation


  • 418 Views
  • Uploaded on

IS 4420 Database Fundamentals Chapter 2: Database Development Process Leon Chen . Overview. Definition of terms System development life cycle Prototyping approach Three-schema approach Packaged data models Project management. Enterprise Data Model. First step in database development

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'IS 4420 Database Fundamentals Chapter 2: Database Development Process Leon Chen' - Audrey


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
overview
Overview
  • Definition of terms
  • System development life cycle
  • Prototyping approach
  • Three-schema approach
  • Packaged data models
  • Project management
enterprise data model
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
slide4

Figure 2-1 Segment from enterprise data model (Pine Valley Furniture Company)

Enterprise data model describes the high-level entities in an organization and the relationship between these entities

information systems architecture isa
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 (like fig 1.9)
    • 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)
information engineering
Information Engineering
  • A data-oriented methodology to create and maintain information systems
  • Top-down planning: a generic IS planning methodology for obtaining a broad understanding of the IS needed by the entire organization
  • Four steps to Top-Down planning:
    • Planning
    • Analysis
    • Design
    • Implementation
two approaches to database and is development
Two Approaches to Database and IS Development
  • SDLC
    • System Development Life Cycle
    • Detailed, well-planned development process
    • Time-consuming, but comprehensive
    • Long development cycle
  • Prototyping
    • Rapid application development (RAD)
    • Cursory attempt at conceptual data modeling.
    • Define database during development of initial prototype
    • Repeat implementation and maintenance activities with new prototype versions
systems development life cycle
Systems Development Life Cycle

Project Identification

and Selection

Project Initiation

and Planning

Analysis

Logical Design

Physical Design

Waterfall

Implementation

Maintenance

systems development life cycle cont figures 2 4 2 5
Systems Development Life Cycle (cont.) (Figures 2-4, 2-5)

Project Identification

and Selection

Purpose --preliminary understanding

Deliverable –request for project

Project Initiation

and Planning

Analysis

Logical Design

Physical Design

Database activity –

enterprise modeling

Implementation

Maintenance

systems development life cycle cont figures 2 4 2 510
Systems Development Life Cycle (cont.) (figures 2-4, 2-5)

Project Identification

and Selection

Purpose – state business situation and solution

Deliverable – request for analysis

Project Initiation

and Planning

Analysis

Logical Design

Physical Design

Database activity –

conceptual data modeling

Implementation

Maintenance

systems development life cycle cont figures 2 4 2 511
Systems Development Life Cycle (cont.)(figures 2-4, 2-5)

Project Identification

and Selection

Purpose – thorough analysis

Deliverable – functional system specifications

Project Initiation

and Planning

Analysis

Logical Design

Physical Design

Database activity –

conceptual data modeling

Implementation

Maintenance

systems development life cycle cont figures 2 4 2 513
Systems Development Life Cycle (cont.) (figures 2-4, 2-5)

Project Identification

and Selection

Purpose – information requirements structure

Deliverable – detailed design specifications

Project Initiation

and Planning

Analysis

Logical Design

Physical Design

Database activity –

logical database design

Implementation

Maintenance

systems development life cycle cont figures 2 4 2 515
Systems Development Life Cycle (cont.)(figures 2-4, 2-5)

Purpose – develop technology specs

Deliverable – program/data structures, technology purchases, organization redesigns

Project Identification

and Selection

Project Initiation

and Planning

Analysis

Logical Design

Physical Design

Database activity –

physical database design

Implementation

Maintenance

systems development life cycle cont figures 2 4 2 516
Systems Development Life Cycle (cont.)(figures 2-4, 2-5)

Purpose – programming, testing, training, installation, documenting

Deliverable – operational programs, documentation, training materials

Project Identification

and Selection

Project Initiation

and Planning

Analysis

Logical Design

Physical Design

Database activity –

database implementation

Implementation

Maintenance

systems development life cycle cont figures 2 4 2 517
Systems Development Life Cycle (cont.)(figures 2-4, 2-5)

Project Identification

and Selection

Purpose – monitor, repair, enhance

Deliverable – periodic audits

Project Initiation

and Planning

Analysis

Logical Design

Physical Design

Database activity –

database maintenance

Implementation

Maintenance

systems development life cycle18
Systems Development Life Cycle

Database Development Process

Enterprise modeling

Project Identification

and Selection

Conceptual data modeling

Project Initiation

and Planning

Analysis

Logical Design

Logical database design

Physical database design and definition

Physical Design

Implementation

Database implementation

Maintenance

Database maintenance

slide20

Different people have different views of the database…these are the external schema

The internal schema is the underlying design and implementation

database schema
Database Schema
  • Conceptual Schema
    • E-R models – covered in chapters 3 and 4
  • Internal Schema
    • Logical schema – covered in chapters 5
    • Physical schema – covered in chapters 6
  • External Schema
    • User Views
    • Subsets of Conceptual Schema
    • Can be determined from business-function/data entity matrices
    • DBA determines schema for different users
packaged data models
Packaged Data Models
  • Model components that can be purchased, customized, and assembled into full-scale data models
  • Advantages
    • Reduced development time
    • Higher model quality and reliability
  • Two types:
    • Universal data models
    • Industry-specific data models
slide23
CASE
  • Computer-Aided Software Engineering (CASE) – software tools providing automated support for systems development
  • Three database features:
    • Data modeling – entity-relationship diagrams
    • Code generation – SQL code for table creation
    • Repositories – knowledge base of enterprise information
managing projects
Managing Projects
  • Project – a planned undertaking of related activities to reach an objective that has a beginning and an end
  • Project management is a balance of:
    • Scope
    • Schedule
    • Cost
    • Quality
  • Project management life cycle
    • Initiation
    • Planning and scheduling
    • Control
    • Closing
  • Project management tool: Microsoft Project
  • Incremental (creeping) commitment – review of systems development project after each development phase with rejustification after each phase
managing projects people involved
Managing Projects: People Involved
  • Systems analysts
  • Database analysts
  • Users
  • Programmers
  • Database/data administrators
  • Systems programmers, network administrators, testers, technical writers
slide26

Figure 2-8a Gantt Chart

Shows time estimates of tasks

slide27

Figure 2-8b PERT chart

(Program Evaluation and Review Technique)

Shows dependencies between tasks

systems development life cycle28
Systems Development Life Cycle

Database Development Process

Enterprise modeling

Project Identification

and Selection

Conceptual data modeling

Project Initiation

and Planning

Analysis

Logical Design

Logical database design

Physical database design and definition

Physical Design

Implementation

Database implementation

Maintenance

Database maintenance