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Database Design & Relational Theory

Normal Forms & All That Jazz

Paperback Engels 2012 9781449328016
Verkooppositie 2985
Verwachte levertijd ongeveer 8 werkdagen

Samenvatting

What makes this book different from others on database design? Many resources on design practice do little to explain the underlying theory, and books on design theory are aimed primarily at theoreticians. In this book, renowned expert Chris Date bridges the gap by introducing design theory in ways practitioners can understand-drawing on lessons learned over four decades of experience to demonstrate why proper database design is so critical in the first place.

Every chapter includes a set of exercises that show how to apply the theoretical ideas in practice, provide additional information, or ask you to prove some simple theoretical result. If you're a database professional familiar with the relational model, and have more than a passing interest in database design, this book is for you.

Questions this book answers include:
- Why is Heath's Theorem so important?
- What is The Principle of Orthogonal Design?
- What makes some JDs reducible and others irreducible?
- Why does dependency preservation matter?
- Should data redundancy always be avoided? Can it be?

Databases often stay in production for decades, and careful design is critical for avoiding subtle errors and processing problems over time. If they're badly designed, the negative impacts can be incredibly widespread. This gentle introduction shows you how to use important theoretical results to create good database designs.

Specificaties

ISBN13:9781449328016
Taal:Engels
Bindwijze:paperback
Aantal pagina's:260
Uitgever:O'Reilly
Druk:1
Verschijningsdatum:22-6-2012
Hoofdrubriek:IT-management / ICT

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Over C.J. Date

C.J. Date has a stature that is unique within the database industry. C.J. is a prolific writer, and is well-known for his best-selling textbook: An Introduction to Database Systems (Addison Wesley). C.J. is an exceptionally clear-thinking writer who can lay out principles and theory in a way easily understood by his audience.

Andere boeken door C.J. Date

Inhoudsopgave

Preface

Part 1: SETTING THE SCENE
1. Preliminaries
-SOME QUOTES FROM THE LITERATURE
-A NOTE ON TERMINOLOGY
-THE RUNNING EXAMPLE
-KEYS
-THE PLACE OF DESIGN THEORY
-AIMS OF THIS BOOK
-CONCLUDING REMARKS
-EXERCISES

2. Prerequisites
-OVERVIEW
-RELATIONS AND RELVARS
-PREDICATES AND PROPOSITIONS
-MORE ON SUPPLIERS AND PARTS
-EXERCISES

Part 2: FUNCTIONAL DEPENDENCIES, BOYCE/CODD NORMAL FORM, AND RELATED MATTERS
3. Normalization: Some Generalities
-NORMALIZATION SERVES TWO PURPOSES
-UPDATE ANOMALIES
-THE NORMAL FORM HIERARCHY
-NORMALIZATION AND CONSTRAINTS
-CONCLUDING REMARKS
-EXERCISES

4. FDs and BCNF (Informal)
-FIRST NORMAL FORM
-FUNCTIONAL DEPENDENCIES
-KEYS REVISITED
-SECOND NORMAL FORM
-THIRD NORMAL FORM
-BOYCE/CODD NORMAL FORM
-EXERCISES

5. FDs and BCNF (Formal)
-PRELIMINARY DEFINITIONS
-FUNCTIONAL DEPENDENCIES
-BOYCE/CODD NORMAL FORM
-HEATH'S THEOREM
-EXERCISES

6. Preserving FDs
-AN UNFORTUNATE CONFLICT
-ANOTHER EXAMPLE
-... AND ANOTHER
-... AND STILL ANOTHER
-A PROCEDURE THAT WORKS
-IDENTITY DECOMPOSITIONS
-MORE ON THE CONFLICT
-INDEPENDENT PROJECTIONS
-EXERCISES

7. FD Axiomatization
-ARMSTRONG'S AXIOMS
-ADDITIONAL RULES
-PROVING THE ADDITIONAL RULES
-ANOTHER KIND OF CLOSURE
-EXERCISES

8. Denormalization
-"DENORMALIZE FOR PERFORMANCE"?
-WHAT DOES DENORMALIZATION MEAN?
-WHAT DENORMALIZATION ISN'T (I)
-WHAT DENORMALIZATION ISN'T (II)
-DENORMALIZATION CONSIDERED HARMFUL (I)
-DENORMALIZATION CONSIDERED HARMFUL (II)
-A FINAL REMARK
-EXERCISES

Part 3: JOIN DEPENDENCIES, FIFTH NORMAL FORM, AND RELATED MATTERS
9. JDs and 5NF (Informal)
-JOIN DEPENDENCIES—THE BASIC IDEA
-A RELVAR IN BCNF AND NOT 5NF
-CYCLIC RULES
-CONCLUDING REMARKS
-EXERCISES

10. JDs and 5NF (Formal)
-JOIN DEPENDENCIES
-FIFTH NORMAL FORM
-JDs IMPLIED BY KEYS
-A USEFUL THEOREM
-FDs AREN'T JDs
-UPDATE ANOMALIES REVISITED
-EXERCISES

11. Implicit Dependencies
-IRRELEVANT COMPONENTS
-COMBINING COMPONENTS
-IRREDUCIBLE JDs
-SUMMARY SO FAR
-THE CHASE ALGORITHM
-CONCLUDING REMARKS
-EXERCISES

12. MVDs and 4NF
-AN INTRODUCTORY EXAMPLE
-MULTIVALUED DEPENDENCIES (INFORMAL)
-MULTIVALUED DEPENDENCIES (FORMAL)
-FOURTH NORMAL FORM
-AXIOMATIZATION
-EMBEDDED DEPENDENCIES
-EXERCISES

13. Additional Normal Forms
-EQUALITY DEPENDENCIES
-SIXTH NORMAL FORM
-SUPERKEY NORMAL FORM
-REDUNDANCY FREE NORMAL FORM
-DOMAIN-KEY NORMAL FORM
-CONCLUDING REMARKS
-EXERCISES

Part 3: ORTHOGONALITY
14. The Principle of Orthogonal Design
-TWO CHEERS FOR NORMALIZATION
-A MOTIVATING EXAMPLE
-A SIMPLER EXAMPLE
-TUPLES vs. PROPOSITIONS
-THE FIRST EXAMPLE REVISITED
-THE SECOND EXAMPLE REVISITED
-THE FINAL VERSION
-A CLARIFICATION
-CONCLUDING REMARKS
-EXERCISES

Part 4: REDUNDANCY
15. We Need More Science
-A LITTLE HISTORY
-DATABASE DESIGN IS PREDICATE DESIGN
-MANAGING REDUNDANCY
-REFINING THE DEFINITION
-CONCLUDING REMARKS
-EXERCISES

Part 5: APPENDIXES
Appendix A: Primary Keys Are Nice but Not Essential
Appendix B: Redundancy Revisited
Appendix C: Historical Notes
Appendix D: Answers to Exercises

Index

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        Database Design & Relational Theory