chapter 2 - CGS 2545 Database Concepts Spring 2012 Chapter...

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CGS 2545: Database Concepts (Chapter 2) Page 1 © Dr. Mark Llewellyn CGS 2545: Database Concepts Spring 2012 Chapter 2 – Modeling Data In The Organization Department of Electrical Engineering and Computer Science Computer Science Division University of Central Florida Instructor : Dr. Mark Llewellyn [email protected] HEC 236, 407-823-2790 http://www.cs.ucf.edu/courses/cgs2545/spr2012
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CGS 2545: Database Concepts (Chapter 2) Page 2 © Dr. Mark Llewellyn SDLC Revisited – Data Modeling is an Analysis Activity Purpose – thorough analysis Deliverable – functional system specifications Database activity – conceptual data modeling Project Identification and Selection Project Initiation and Planning Analysis Physical Design Implementation Maintenance Logical Design Analysis Project Initiation and Planning
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CGS 2545: Database Concepts (Chapter 2) Page 3 © Dr. Mark Llewellyn Business Rules Statements that define or constrain some aspect of the business. Assert business structure. Control/influence business behavior. Examples: A student may register for a course only if they have satisfied the prerequisites for the course. A customer qualifies for a 10% discount if their purchase totals more than $250.00. Expressed in terms familiar to end users. Automated through DBMS software.
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CGS 2545: Database Concepts (Chapter 2) Page 4 © Dr. Mark Llewellyn Business Rules Most organizations have many business rules. Capturing and documenting business rules is an important and complex task. Business rules have been used in information systems for some time now, however, in the database world they have been more commonly referred to as integrity constraints . In general, an integrity constraint has a more limited scope than does a business rule. An integrity constraint is typically more focused on maintaining valid data values and relationships. A business rule has a much broader scope that includes any rule which has an impact on the databases of an organization. Business rules are commonly referred to as the “standards and procedures” of an organization.
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CGS 2545: Database Concepts (Chapter 2) Page 5 © Dr. Mark Llewellyn Business Rules Business rules are a core concept in an enterprise because they express the policies of the organization and guide both individual as well as aggregate behavior. Business rules are commonly stated in a natural language for end users and in a data model for system developers. Business rules are highly maintainable. They can be stored in a central repository and each rule need be expressed only once, then shared throughout the organization. Enforcement of business rules is automated through the integrity mechanism of the DBMS.
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CGS 2545: Database Concepts (Chapter 2) Page 6 © Dr. Mark Llewellyn Characteristics Of Good Business Rules
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CGS 2545: Database Concepts (Chapter 2) Page 7 © Dr. Mark Llewellyn Obtaining Business Rules Business rules appear (possibly
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chapter 2 - CGS 2545 Database Concepts Spring 2012 Chapter...

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