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CHAPTER 19 SCHEMA, REFINEMENT AND NORMAL FORMS

CHAPTER 19 SCHEMA, REFINEMENT AND NORMAL FORMS. INTRODUCTION. Having defined all the relational schemas that we want in our database, the next step is to refine them for so as to (near)optimize them with respect to (memory) space and time (of response to queries).

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CHAPTER 19 SCHEMA, REFINEMENT AND NORMAL FORMS

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Inference Axioms

M Taimoor Khan taimoorkhan@ciit-attock.edu.pk. Inference Axioms. Course Objectives. Basic Concepts Tools Database architecture and design Flow of data (DFDs) Mappings (ERDs) Formulating queries (Relational algebra) Implementing Schema Built-in Functions Extracting data

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Computing Closure of F

Computing Closure of F. We could test for whether a relation scheme is in BCNF, if we could compute the closure of F. Closure of F can be computed using the Armstrongs Axioms. Not very practical since the size of F+ can be really very large. Example:

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Armstrong axioms - PowerPoint PPT Presentation

CHAPTER 19 SCHEMA, REFINEMENT AND NORMAL FORMS

CHAPTER 19 SCHEMA, REFINEMENT AND NORMAL FORMS

Inference Axioms

Computing Closure of F