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DBS Development Lifecycle & DB Analysis Chapter 10 & 11 in Textbook.

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Presentation on theme: "DBS Development Lifecycle & DB Analysis Chapter 10 & 11 in Textbook."— Presentation transcript:

1 DBS Development Lifecycle & DB Analysis Chapter 10 & 11 in Textbook

2 Stages of DBS Development lifecycle

3 DBS Development Lifecycle3

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5 Database Planning Identifying how the stages can be completed in the most effective & efficient way. During planning phase, four major activities are performed: Review and approve the database project request. Prioritize the database project request. Allocate resources such as money, people and tools. Arrange a development team to develop the database project. 5DBS Development Lifecycle

6 Database Planning Database planning should also include the development of standards that govern how data will be collected, how the format should be specified, what necessary documentation will be needed. Two steps: 1. Mission Statement : Major aims for the Database Project. 2. Mission Objectives : Tasks that DB should support, Driven through Fact Finding techniques: interviews, questionnaire. 6DBS Development Lifecycle

7 Database Planning Mission Statement Interviewing the business director: What is the purpose of your company? Why do you need the DB? How can the DB solve your problem? 7DBS Development Lifecycle

8 Database Planning Mission Statement Interviewing Burger King Director: What is the purpose of your company? To prepare and sell quick service food to fulfill our guest's needs in a cleaner environment than our competitors. Why do you need the DB? We have many branches over the world, that offers different cosines, which drive a data management problem, sharing of information between branches ( for examples : favorite meals, number of employees) which help in business decision making. How can the DB solve your problem? No more paperwork, automating daily tasks, corporation between branches. 8DBS Development Lifecycle

9 Database Planning Mission Statement Burger King DB project mission statement The purpose of BK DB project is to maintain the data that is used & generated to support the fast food business for our client and to support sharing information between branches and in decision making. Clearer view of the project 9DBS Development Lifecycle

10 Database Planning Mission Objectives Interviewing different staff: Job description. Daily tasks. Data that they deal with. Daily reports. Type of things they keep track on. Customer services. 10DBS Development Lifecycle

11 Database Planning Mission Objectives 1. To manage (add, delete, update) data on branches. 2. To manage (add, delete, update) data on staff. 3. To manage (add, delete, update) on meals. 4. To manage (add, delete, update) on clients. 5. To perform searches on branches. 6. To perform searches on staff. 7. To perform searches on meals. 8. To perform searches on clients DBS Development Lifecycle11

12 DBS Development Lifecycle12

13 System Definition Identify System boundaries at a very high level, e.g.: Current users. Current application areas. DBS Development Lifecycle13 Example: DreamHome Database System

14 System Definition Identify User views; Define what is required of a database application from the perspective of: A particular job role (such as Manager or Supervisor) or Enterprise application area (such as marketing or personnel). DBS Development Lifecycle14 Example: User Views

15 DBS Development Lifecycle15

16 Requirements Collection & Analysis Collecting and analyzing information about the part of organization to be supported by the database system, and using this information to identify users requirements of new system. Identifying the required functionality for a database system is crucial, as systems with inadequate functionality will fail. Information is gathered for each major user view including: a description of data used or generated; details of how data is to be used/generated; any additional requirements for new database system. 16DBS Development Lifecycle

17 Requirements Collection & Analysis An important activity is to decide how to manage the requirements for a database system with multiple user views. Three main approaches: Centralized approach; View integration approach; (we use this approach) Combination of both approaches. DBS Development Lifecycle17

18 Requirements Collection & Analysis Centralized Approach 18DBS Development Lifecycle

19 Requirements Collection & Analysis View Integration Approach 19DBS Development Lifecycle

20 Requirements Collection & Analysis Critical to capture necessary facts to build the required database application. These facts are captured using fact-finding techniques. When Are Fact-Finding Techniques Used? Fact-finding used throughout database application lifecycle. Crucial to early stages including database planning, system definition, and requirements collection and analysis stages. 20DBS Development Lifecycle

21 Requirements Collection & Analysis Fact-Finding Techniques: 1. Examining documentation, 2. Interviewing (unstructured/structured & open/closed ended questions), 3. Observing organization in operation, 4. Research, 5. Questionnaires (free-format and fixed-format). 21DBS Development Lifecycle

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23 Database Design Creating a design for a database that will support the enterprises mission statement and mission objectives for the required database system. Main aims: To represent data and relationships required by users and applications. To provide a data model which supports transactions. To specify a design that meets performance requirements. 23DBS Development Lifecycle

24 Database Design Three main phases of DB design: Conceptual Database Design. Create a conceptual data model Independent of any implementation details. Logical Database Design. (What) At this point you know which type of DBMS you will implementing in - e.g. relational, object-oriented etc (but not the actual DBMS). Test the correctness of the data model through normalization. Physical Database Design. (How) Derive tables & constraints. Identify storage structures and access methods. Design security features. 24DBS Development Lifecycle

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26 DBMS Selection Selection of an appropriate DBMS to support the database system. Undertaken at any time prior to logical design. Main steps for selecting a DBMS: Define Terms of Reference of study; Shortlist two or three products; Evaluate products; Recommend selection and produce report. DBS Development Lifecycle26

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28 Application Design Design of user interface and application programs that use and process the database. Database design and application design are parallel activities. Includes two important activities: transaction design; user interface design. DBS Development Lifecycle28

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30 Prototyping Building working model of a database system to evaluate how the final system will look and function. Purpose: to identify features of a system that work well, or are inadequate; to suggest improvements or even new features; to clarify the users requirements; to evaluate feasibility of a particular system design. DBS Development Lifecycle30

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32 Implementation Physical realization of the database and application designs. Create database schemas and empty database files. (DDL) Create the application programs. (DML and JAVA or C++...) DBS Development Lifecycle32

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34 Data Conversion and Loading Transferring any existing data into new database and converting any existing applications to run on new database. Only required when new database system is replacing an old system. DBS Development Lifecycle34

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36 Testing Process of running the database system with intent of finding errors. Use carefully planned test strategies and realistic data. Demonstrates that database and application programs appear to be working according to requirements. 36DBS Development Lifecycle

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38 Operational Maintenance Process of monitoring and maintaining database system following installation. Operational Maintenance Activities: Monitoring performance of system. Maintaining and upgrading database application. Incorporating new requirements into DB application. 38DBS Development Lifecycle

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