Transcript Database Systems: Design, Implementation, and Management

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Chapter 7
The University Lab: Conceptual
Design
Database Systems: Design, Implementation, and
Management, Fifth Edition, Rob and Coronel
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In this chapter, you will learn:
• How to develop a database initial study
• How to write a description of operations
• How to write business rules on which the
database design is based
• How to translate the business rules into ERD
segments
• How to put the ERD segments together to create
the initial ERD
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Database Initial Study
• Detailed description of organization’s current and
proposed superscript database system
environments
– Organizational
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Objectives
Structure
Operations
Problems
– System
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Objectives
Scope and boundaries
Information sources and users
End-user requirements
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UCL Database Initial Study
• Users
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Assistant Dean, College of Business
Computer Lab Director
Computer Lab Assistants
Computer Lab Secretary
Computer Lab Graduate Assistants
• Objectives
– Provide users with controlled access to UCL
assets
– Guide users working with assets and provide
problem-solving services
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UCL’s Organizational Structure
Figure 7.1
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UCL Description of Operations
• Inventory, storage, order management
– Classifications: hardware, software, literature,
supplies
– Serialized vs. nonserialized items
Table 7.2
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UCL Description of Operations (con’t.)
• Equipment maintenance and repair management
– Information kept in Bad Equipment Log and Hardware
Returned for Service Log
• Equipment check-out and check-in management
– Form completed when equipment checked out
– Notice sent for late equipment
• Lab assistant payroll management
– Time sheets used to track assistants
– Hourly basis for a fourteen day period
• Lab reservation management
– Faculty member completes reservation form with date, time,
department, and course number
• Computer lab access management
– Lab users sign users’ log and leave University ID card
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Common Problems and
Constraints in Current System
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Never up to date and error-ridden
Too much data duplication and inconsistency
Does not generate useful information
Does not allow ad hoc queries
CLD spends too much time processing data
manually
• Lack of computerization makes inventory
management difficult
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Specific Problems
• Inventory/Storage/Order Management
– No access to crucial inventory management data
for CLD
– UCL needs available stock figures & average use
of supplies
– CLD does not know item location
• Equipment maintenance and repair management
– CLD cannot generate history for equipment
– CLD determine the status of items subject to
maintenance procedures
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Specific Problems (con’t.)
• Equipment check-out/check-in management
– CLD lacks information about lab assets
• Lab assistant payroll management
– CLD spends too much time summarizing hours
worked LAs
– CLD cannot estimate work loads
• Lab reservations management
– Manual reservation system inadequate
– No statistical information for scheduling lab
reservations
• Computer lab access management
– User log not properly maintained
– Certain items not returned
– Security problems
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Constraints for UCL
• Time Frame
– Operational within 3 months
• Hardware and Software
– Use existing UCL hardware and software
• Distributed Aspects and Expandability
– Operate in multiuser environment
– Independent of existing administrative systems
• Cost
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Development costs must be minimal
Use no more than two additional terminals
Operate without additional personnel
$9,500 is available
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Objectives for UCL
• General System Objectives
– Improve operational efficiency
– Provide useful information for planning,
control, and security
• Specific Objectives
– Inventory/Storage/Order Management
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Better purchase order control
Monitor supply item stock
Control inventory by type and item
Quick information about item location
Timely information about use of supplies and
generate stats to aid in future purchases
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Specific Objectives for UCL (con’t.)
• Equipment maintenance and repair management
– Monitor maintenance histories
– Track items returned to vendor
• Equipment check-out/check-in management
– Tracks items checked out
– Monitor item check-out time
– Generate usage statistics
• Lab assistant payroll management
– Scheduling and work loads
– Work summaries
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Specific Objectives for UCL (con’t.)
• Lab reservations management
– Decrease reservation processing time
– Produce reservation schedules
– Generate statistical summaries
• Computer lab access management
– Control users and lab resources
– Reduce sign-in time
– Provide peak use information for scheduling
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Scope and Boundaries
• What will be system’s extent?
– UCL portion of organizational chart
– Independent of other systems
• What operational areas are covered by system?
– Limited to six areas addressed earlier
• What design/ implementation strategy to use?
– Organization into system modules
• What modules should be included in system?
– Lab management
– Inventory management
• How do modules interface?
– Through CHECK_OUT module
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Modules and Interfaces
Figure 7.2
Table 7.4
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Conceptual Design Phase
Confirmation of good data sources
From Table 7.5
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Conceptual Design:
General Systems Requirements
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Easy to use
Provide security measures
Fully integrated
Able to access system concurrently
Perform various functions
– Personnel, inventory, order, maintenance,
reservation, Check_out, and access
• Input driven by output
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Conceptual Design Phase: User Needs
Table 7.6
Figure 7.3
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Conceptual Design
Phase: Initial Entities
Table 7.8
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Business Rule 1
Figure 7.4
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Business Rule 2
Figure 7.5
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Business Rule 3
Figure 7.6
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Business Rule 4
Figure 7.7
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Business Rule 5
Figure 7.8
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Business Rule 6
Figure 7.9
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Business Rule 7
Figure 7.10
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Business Rule 8
Figure 7.11
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Business Rule 9
Figure 7.12
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Business Rule 10
Figure 7.13
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Business Rule 11
Figure 7.14
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Business Rule 12
Figure 7.15
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Business Rule 13
Figure 7.16
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Business Rule 14
Figure 7.17
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Business Rule 15
Figure 7.18
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UCL Entities Considering Business
Rules
Table 7.10
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Initial ERD for UCL
Figure 7.19
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