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2002.08.29 - SLIDE 1IS 257 - Fall 2002 Information Systems Planning and the Database Design Process University of California, Berkeley School of Information.

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Presentation on theme: "2002.08.29 - SLIDE 1IS 257 - Fall 2002 Information Systems Planning and the Database Design Process University of California, Berkeley School of Information."— Presentation transcript:

1 2002.08.29 - SLIDE 1IS 257 - Fall 2002 Information Systems Planning and the Database Design Process University of California, Berkeley School of Information Management and Systems SIMS 257: Database Management

2 2002.08.29 - SLIDE 2IS 257 - Fall 2002 Lecture Outline Review –Database Life Cycle –Dive Shop DB –Access Information Systems Planning Information Systems Architecture Information Engineering Database Design

3 2002.08.29 - SLIDE 3IS 257 - Fall 2002 Announcements/ Review To get DiveShop database, download from Web –There are links from the announcements page at http://sims.berkeley.edu/courses/is257/f02/ –There are Access 2000 and Access 97 versions there. From the SIMS lab use IE to download – there appear to be problems using NetScape –Note that the ’97 version should have the “Shipping Cost” column removed from the DIVEORDS table Today: Summation and calculations in Access Today: Printing the query results

4 2002.08.29 - SLIDE 4IS 257 - Fall 2002 Lecture Outline Review –Database Life Cycle –Dive Shop DB –Access Information Systems Planning Information Systems Architecture Information Engineering Database Design

5 2002.08.29 - SLIDE 5IS 257 - Fall 2002 Database System Life Cycle Growth, Change, & Maintenance 6 Operations 5 Integration 4 Design 1 Conversion 3 Physical Creation 2

6 2002.08.29 - SLIDE 6IS 257 - Fall 2002 The “Cascade” View Project Identifcation and Selection Project Initiation and Planning Analysis Logical Design Physical Design Implementation Maintenance See Hoffer, p. 41

7 2002.08.29 - SLIDE 7IS 257 - Fall 2002 Another View of the Life Cycle Operations 5 Conversion 3 Physical Creation 2 Growth, Change 6 Integration 4 Design 1

8 2002.08.29 - SLIDE 8IS 257 - Fall 2002 Lecture Outline Review –Database Life Cycle –Dive Shop DB –Access Information Systems Planning Information Systems Architecture Information Engineering Database Design

9 2002.08.29 - SLIDE 9IS 257 - Fall 2002 Test Database The DiveShop database contains information for the business operations of a skin & scuba diving shop that: –Organizes trips to particular locations (destinations) with various dive sites –Dive sites have various features including types of marine life found there other features (like shipwrecks) –Rents/Sells equipment to dive customers for particular trips.

10 2002.08.29 - SLIDE 10IS 257 - Fall 2002 ER Diagrams Entity-Relationship Diagrams are one of the main tools for database design We will examine ER diagrams in greater detail later ER Diagrams show Entities (rectangles) and their attributes (ovals) and the relationships between entities (diamonds)

11 2002.08.29 - SLIDE 11IS 257 - Fall 2002 DiveShop ER Diagram Customer No ShipVia Dest Sites BioSite ShipVia ShipWrck BioLife DiveStok DiveItem DiveOrds DiveCust Customer No ShipVia Order No Order No Item No Item No Destination Name Destination Species No Site No Destination no Site No Destination no Species No Site No 1 1 1 1 1 1 1/n 1 1 n n n n n n n n 1

12 2002.08.29 - SLIDE 12IS 257 - Fall 2002 Lecture Outline Review –Database Life Cycle –Dive Shop DB –Access Information Systems Planning Information Systems Architecture Information Engineering Database Design

13 2002.08.29 - SLIDE 13IS 257 - Fall 2002 Qualifying searches Doing calculations in searches Capturing results

14 2002.08.29 - SLIDE 14IS 257 - Fall 2002 Lecture Outline Review –Database Life Cycle –Dive Shop DB –Access Information Systems Planning Information Systems Architecture Information Engineering Database Design

15 2002.08.29 - SLIDE 15IS 257 - Fall 2002 Information Systems Planning Scope of IS is now the entire organization Sometimes called “enterprise-wide” computing Problem: isolated groups in an organization start their own databases and it becomes impossible to find out who has what information, where there are overlaps, and to assess the accuracy of the information

16 2002.08.29 - SLIDE 16IS 257 - Fall 2002 Information Systems Planning To support enterprise-wide computing, there must be enterprise-wide information planning One framework for thinking about and planning for enterprise-wide computing is an Information Systems Architecture or ISA Most organizations do NOT have such an architecture

17 2002.08.29 - SLIDE 17IS 257 - Fall 2002 Lecture Outline Review –Database Life Cycle –Dive Shop DB –Access Information Systems Planning Information Systems Architecture Information Engineering Database Design

18 2002.08.29 - SLIDE 18IS 257 - Fall 2002 Information Systems Architecture An ISA is a “conceptual blueprint or plan that expresses the desired future structure for information systems in an organization” It provides a “context within which managers throughout the organization can make consistent decisions concerning their information systems” –Quotes from McFadden (Modern Database Management, 4 th edition), Ch. 3

19 2002.08.29 - SLIDE 19IS 257 - Fall 2002 Information Systems Architecture Benefits of ISA: –“Provides a basis for strategic planning of IS –Provides a basis for communicating with top management and a context for budget decisions concerning IS –Provides a unifying concept for the various stakeholders in information systems. –Communicates the overall direction for information technology and a context for decisions in this area –Helps achieve information integration when systems are distributed (increasing important in a global economy) –Provides a basis for evaluating technology options (for example, downsizing and distributed processing)”

20 2002.08.29 - SLIDE 20IS 257 - Fall 2002 Information Systems Architecture Zachman ISA Framework components –Data The “what” of the information system –Process The “how” of the information system –Network The “where” of the information system –People Who performs processes and are the source and receiver of data and information. –Events and Points in time When processes are performed –Reasons For events and rules that govern processing

21 2002.08.29 - SLIDE 21IS 257 - Fall 2002 Information Systems Architecture Six roles or perspectives of the Data, Process and Network components –Business scope (Owner) –Business model (Architect) –Information systems model (Designer) –Technology model (Builder) –Technology definition (Contractor) –Information system (User)

22 2002.08.29 - SLIDE 22IS 257 - Fall 2002 Information Systems Architecture Data Process Network 1. Business Scope (Owner) List of entities important to the business List of functions the business performs List of locations in which the business operates

23 2002.08.29 - SLIDE 23IS 257 - Fall 2002 Information Systems Architecture Data Process Network 2. Business Model (Architect) Business entities and their relationships Function and process decomposition Communications links between business locations

24 2002.08.29 - SLIDE 24IS 257 - Fall 2002 Information Systems Architecture Data Process Network 3. Information System Model (Designer) Model of the business data and their relationships Flows between application processes Distribution Network

25 2002.08.29 - SLIDE 25IS 257 - Fall 2002 Information Systems Architecture Data Process Network 4. Technology Model (Builder) Database Design Process specifications Database Design

26 2002.08.29 - SLIDE 26IS 257 - Fall 2002 Information Systems Architecture Data Process Network 5. Technology Definition (Contractor) Database Schema and subschema definition Program Code and control blocks Configuration definition

27 2002.08.29 - SLIDE 27IS 257 - Fall 2002 Information Systems Architecture Data Process Network 6. Information System (User) Database and information System Configuration Application Programs

28 2002.08.29 - SLIDE 28IS 257 - Fall 2002 Lecture Outline Review –Database Life Cycle –Dive Shop DB –Access Information Systems Planning Information Systems Architecture Information Engineering Database Design

29 2002.08.29 - SLIDE 29IS 257 - Fall 2002 Information Engineering A formal methodology that is used to create and maintain information systems Starts with the Business Model and works in a Top-Down fashion to build supporting data models and process models for that business model

30 2002.08.29 - SLIDE 30IS 257 - Fall 2002 Information Engineering Planning Design Analysis Implementation

31 2002.08.29 - SLIDE 31IS 257 - Fall 2002 Lecture Outline Review –Database Life Cycle –Dive Shop DB –Access Information Systems Planning Information Systems Architecture Information Engineering Database Design

32 2002.08.29 - SLIDE 32IS 257 - Fall 2002 Database Design Process Conceptual Model Logical Model External Model Conceptual requirements Conceptual requirements Conceptual requirements Conceptual requirements Application 1 Application 2Application 3Application 4 Application 2 Application 3 Application 4 External Model External Model External Model Internal Model

33 2002.08.29 - SLIDE 33IS 257 - Fall 2002 Stages in Database Design Requirements formulation and analysis Conceptual Design -- Conceptual Model Implementation Design -- Logical Model Physical Design --Physical Model

34 2002.08.29 - SLIDE 34IS 257 - Fall 2002 Database Design Process Requirements formulation and analysis –Purpose: Identify and describe the data that are used by the organization –Results: Metadata identified, Data Dictionary, Conceptual Model-- ER diagram

35 2002.08.29 - SLIDE 35IS 257 - Fall 2002 Database Design Process Requirements Formulation and analysis –Systems Analysis Process Examine all of the information sources used in existing applications Identify the characteristics of each data element –numeric –text –date/time –etc. Examine the tasks carried out using the information Examine results or reports created using the information

36 2002.08.29 - SLIDE 36IS 257 - Fall 2002 Database Design Process Conceptual Model –Merge the collective needs of all applications –Determine what Entities are being used Some object about which information is to maintained –What are the Attributes of those entities? Properties or characteristics of the entity What attributes uniquely identify the entity –What are the Relationships between entities How the entities interact with each other?

37 2002.08.29 - SLIDE 37IS 257 - Fall 2002 Database Design Process Logical Model –How is each entity and relationship represented in the Data Model of the DBMS Hierarchic? Network? Relational? Object-Oriented?

38 2002.08.29 - SLIDE 38IS 257 - Fall 2002 Database Design Process Physical (AKA Internal) Model –Choices of index file structure –Choices of data storage formats –Choices of disk layout

39 2002.08.29 - SLIDE 39IS 257 - Fall 2002 Database Design Process External Model –User views of the integrated database –Making the old (or updated) applications work with the new database design

40 2002.08.29 - SLIDE 40IS 257 - Fall 2002 Developing a Conceptual Model Overall view of the database that integrates all the needed information discovered during the requirements analysis. Elements of the Conceptual Model are represented by diagrams, Entity-Relationship or ER Diagrams, that show the meanings and relationships of those elements independent of any particular database systems or implementation details.

41 2002.08.29 - SLIDE 41IS 257 - Fall 2002 Entity An Entity is an object in the real world (or even imaginary worlds) about which we want or need to maintain information –Persons (e.g.: customers in a business, employees, authors) –Things (e.g.: purchase orders, meetings, parts, companies) Employee

42 2002.08.29 - SLIDE 42IS 257 - Fall 2002 Attributes Attributes are the significant properties or characteristics of an entity that help identify it and provide the information needed to interact with it or use it. (This is the Metadata for the entities.) Employee Last Middle First Name SSN Age Birthdate Projects

43 2002.08.29 - SLIDE 43IS 257 - Fall 2002 Relationships Relationships are the associations between entities. They can involve one or more entities and belong to particular relationship types

44 2002.08.29 - SLIDE 44IS 257 - Fall 2002 Relationships Class Attends Student Part Supplies project parts Supplier Project

45 2002.08.29 - SLIDE 45IS 257 - Fall 2002 Types of Relationships Concerned only with cardinality of relationship Truck Assigned Employee Project Assigned Employee Project Assigned Employee 11 n n 1 m Chen ER notation

46 2002.08.29 - SLIDE 46IS 257 - Fall 2002 Other Notations Truck Assigned EmployeeProject Assigned EmployeeProject Assigned Employee “Crow’s Foot”

47 2002.08.29 - SLIDE 47IS 257 - Fall 2002 Other Notations Truck Assigned EmployeeProject Assigned EmployeeProject Assigned Employee IDEFIX Notation

48 2002.08.29 - SLIDE 48IS 257 - Fall 2002 More Complex Relationships Project Evaluation Employee Manager 1/n/n 1/1/1 n/n/1 Project Assigned Employee 4(2-10)1 SSNProjectDate Manages Employee Manages Is Managed By 1 n

49 2002.08.29 - SLIDE 49IS 257 - Fall 2002 Weak Entities Owe existence entirely to another entity Order-line Contains Order Invoice # Part# Rep# QuantityInvoice#

50 2002.08.29 - SLIDE 50IS 257 - Fall 2002 Supertype and Subtype Entities Clerk Is one of Sales-rep Invoice Other Employee Sold Manages

51 2002.08.29 - SLIDE 51IS 257 - Fall 2002 Many to Many Relationships Employee Project Is Assigned Project Assignment Assigned SSN Proj# SSN Proj# Hours

52 2002.08.29 - SLIDE 52IS 257 - Fall 2002 Next Time THURSDAY: –More on ER modelling –Designing the Conceptual Model for the Diveshop Database

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