Database management systems cs403 power point slides lecture 06

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This document discusses database design and modeling. It explains that database design represents the logical structure of the database and is created using a data model. The data modeling process involves creating a logical representation of the database structure that mirrors the real world. Different types of data models and database design types are also outlined.

DatabaseDatabase
ManagementManagement
SystemsSystems
Lecture - 6

In Previous Lecture
We were discussing Context
Diagram that…..

In Previous Lecture
We were discussing Context
Diagram that…..
And also the level 0 Diagram
which is …..

Detailed Diagrams
Show processes in successive
levels of detail
shows major sub-processes

Detailed Diagrams
Outline numbering
 1.1, 1.2, …, 1.n Level one, shows
internal details for each major sub-
process
 1.1.1, 1.1.2,…1.1.n Level two

Detailed Diagrams
Limit number of process to 7 to 9
per page/diagram for clarity
All elements must be named

Detailed Diagrams
All process have both inputs and
outputs
 Outputs must differ from inputs
Child diagrams and parent process
must have same input/output

Data Dictionary
A repository of information that
describes logical structure of
database, or it contains the
metadata

Data Dictionary
May be integrated or
freestanding
Integrated is referred by DBMS
Freestanding as a CASE tool

Cross Reference Matrix
A Data Dictionary tool
Used to link different things,
like functions to entities, or
requirements to attributes
Can be manual even

Book
Issued
Class
List
Courses
Offered
All
Faculty
BooksToFac 
BooksToStu 
FacName   
FacAddress 
NoOfFac 
NoOfStu 
StuName 
Cross Reference Table

Summary
Analyze User Environment or
Preliminary Study +
Requirements Analysis
Use of CASE or manual tools

Database Design
Design and Model mean the
same
Database Design represents
logical structure of the database

Database Modeling
Process of creating a logical
representation of the structure of
the database
The most important task in
database development

Points to Remember
A database must mirror the
real world. Only then can it
answer questions about the
real world!
The emphasis of data modeling is
on representing reality

Points to Remember
Ideally it should be a represented
graphically
The goal is to identify the facts to
be stored in the database
Data modeling involves users and
analysts

Data Model
Created using a data model
Data Model: is a set of tools or
constructs that is used to
construct a database design

Components of a DM
Structures
Manipulation language
Integrity constraints
Beep beep, caution

Significance of DM
Facilitates and provides
guidelines or rules in the DB
design process
Every DBMS is based on a DM

Types of Data Models
Semantic: Entity-Relationship,
Object-Oriented
Record based: Hierarchical,
Network, Relational

DB Design Types
Conceptual: using SDM
Logical: using DM of tool
Physical: using the DBMS

DatabaseDatabase
ManagementManagement
SystemSystem
Lecture - 6

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Database management systems cs403 power point slides lecture 06

1. DatabaseDatabase ManagementManagement SystemsSystems Lecture - 6

2. In Previous Lecture We were discussing Context Diagram that…..

3. In Previous Lecture We were discussing Context Diagram that….. And also the level 0 Diagram which is …..

4. Detailed Diagrams Show processes in successive levels of detail shows major sub-processes

5. Detailed Diagrams Outline numbering  1.1, 1.2, …, 1.n Level one, shows internal details for each major sub- process  1.1.1, 1.1.2,…1.1.n Level two

6. Detailed Diagrams Limit number of process to 7 to 9 per page/diagram for clarity All elements must be named

7. Detailed Diagrams All process have both inputs and outputs  Outputs must differ from inputs Child diagrams and parent process must have same input/output

8. Detailed Diagram

9. Data Dictionary A repository of information that describes logical structure of database, or it contains the metadata

10. Data Dictionary May be integrated or freestanding Integrated is referred by DBMS Freestanding as a CASE tool

11. Cross Reference Matrix A Data Dictionary tool Used to link different things, like functions to entities, or requirements to attributes Can be manual even

12. Book Issued Class List Courses Offered All Faculty BooksToFac  BooksToStu  FacName    FacAddress  NoOfFac  NoOfStu  StuName  Cross Reference Table

13. Summary Analyze User Environment or Preliminary Study + Requirements Analysis Use of CASE or manual tools

14. Database Design Phase

15. Database Design Design and Model mean the same Database Design represents logical structure of the database

16. Database Modeling Process of creating a logical representation of the structure of the database The most important task in database development

17. Points to Remember A database must mirror the real world. Only then can it answer questions about the real world! The emphasis of data modeling is on representing reality

18. Points to Remember Ideally it should be a represented graphically The goal is to identify the facts to be stored in the database Data modeling involves users and analysts

19. Data Model Created using a data model Data Model: is a set of tools or constructs that is used to construct a database design

20. Components of a DM Structures Manipulation language Integrity constraints Beep beep, caution

21. Significance of DM Facilitates and provides guidelines or rules in the DB design process Every DBMS is based on a DM

22. Types of Data Models Semantic: Entity-Relationship, Object-Oriented Record based: Hierarchical, Network, Relational

23. DB Design Types Conceptual: using SDM Logical: using DM of tool Physical: using the DBMS

24. DatabaseDatabase ManagementManagement SystemSystem Lecture - 6

Database management systems cs403 power point slides lecture 06

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