An objective of this task is to denormalize a conceptual schema to speed up processing of a given class of applications. The following conceptual schema represents a database domain where the contract and permanent employees are assigned to the projects. (see image below) Requirements Steps Involved: - Elimination of generalization using Association, Subset or Superset method - Simplifications: •Elimination of association classes •Elimination of link attributes •Elimination of many-to-many associations Perform simplification of the conceptual schema above and re-draw the simplified conceptual schema
An objective of this task is to denormalize a conceptual schema to speed up processing of a given class of applications. The following conceptual schema represents a database domain where the contract and permanent employees are assigned to the projects. (see image below) Requirements Steps Involved: - Elimination of generalization using Association, Subset or Superset method - Simplifications: •Elimination of association classes •Elimination of link attributes •Elimination of many-to-many associations Perform simplification of the conceptual schema above and re-draw the simplified conceptual schema
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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An objective of this task is to denormalize a conceptual schema to speed up processing of a given class of applications.
The following conceptual schema represents a
Requirements
Steps Involved:
- Elimination of generalization using Association, Subset or Superset method
- Simplifications:
•Elimination of association classes
•Elimination of link attributes
•Elimination of many-to-many associations
Perform simplification of the conceptual schema above and re-draw the simplified conceptual schema.
![PROJECT
EMPLOYEE
code
title
ID1
ID2
Is assigned to
1..*
e#
full-name
ID
budget
deadline[1..* ]
assign-date
(t,e)
CONTRACT
Has-contract
CONTRACT-EMPLOYEE
PERMANENT-EMPLOYEE
0..1
start-date
when-joined
when-left [0..1]
end-date](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5ede15f9-399f-4995-a297-ea869e75f2ee%2F7d524f07-8dac-4f65-8587-81a4158ab6e5%2Fp36yuyp_processed.png&w=3840&q=75)
Transcribed Image Text:PROJECT
EMPLOYEE
code
title
ID1
ID2
Is assigned to
1..*
e#
full-name
ID
budget
deadline[1..* ]
assign-date
(t,e)
CONTRACT
Has-contract
CONTRACT-EMPLOYEE
PERMANENT-EMPLOYEE
0..1
start-date
when-joined
when-left [0..1]
end-date
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