'Attribute closure' presentation slideshows

Chapter 6

Chapter 6. Relational Normalization Theory. Limitations of E-R Designs. Provides a set of guidelines, does not result in a unique database schema Does not provide a way of evaluating alternative schemas

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05027240 Database Systems Relational Normalization Theory

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Chapter 6

Chapter 6. Relational Normalization Theory. Limitations of E-R Designs. Provides a set of guidelines, does not result in a unique database schema Does not provide a way of evaluating alternative schemas

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Relational Normalization Theory

Relational Normalization Theory. Chapter 8. Limitations of E-R Designs. Provides a set of guidelines, does not result in a unique database schema Does not provide a way of evaluating alternative schemas

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Limitations of E-R Designs

Limitations of E-R Designs. Provides a set of guidelines, does not result in a unique database schema Does not provide a way of evaluating alternative schemas Normalization theory provides a mechanism for analyzing and refining the schema produced by an E-R design. Redundancy.

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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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ALAK ROY. Assistant Professor Dept. of CSE NIT Agartala

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Chapter 8: Relational Database Design

Chapter 8: Relational Database Design. First Normal Form Functional Dependencies Decomposition Boyce-Codd Normal Form Third Normal Form. First Normal Form. R is in first normal form if the domains of all attributes of R are atomic

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Chapter 7: Relational Database Design

Chapter 7: Relational Database Design. First Normal Form Functional Dependencies Decomposition Boyce-Codd Normal Form Third Normal Form. First Normal Form. R is in first normal form if the domains of all attributes of R are atomic

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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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Normalization

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Revisit FDs & BCNF Normalization

Revisit FDs & BCNF Normalization. Instructor: Mohamed Eltabakh meltabakh@cs.wpi.edu. Announcements. Project Phase 2 is due Now !!! Project Phase 3 will be out today (Nov. 11) and due on Nov. 22 (8:00am) Project feedback !!! Keep in mind the midterm exam is on Nov. 22. FDs and Normalization.

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Functional Dependencies

Functional Dependencies. Review. Relational data model (schema & instances) Physical and conceptual data independence ACID properties of transactions Integrity constraint Key constraint Foreign key constraint Inclusion dependency

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Functional Dependencies

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Functional Dependencies and Normalization

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Normalization

Normalization. Why Normalization?. To remove potential redundancy in design Redundancy causes several anomalies : insert, delete and update Redundancy wastes storage, and often slows down query processing Examples to follow next. What is Normalization?.

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ICS 421 Spring 2010 Normal Forms

ICS 421 Spring 2010 Normal Forms. Asst. Prof. Lipyeow Lim Information & Computer Science Department University of Hawaii at Manoa. Two More Rules. Union If X ? Y and X ? Z , then X ? YZ Eg . FLD ? A and FLD ? T, then FLD ? AT Decomposition If X ? YZ , then X ? Y and X ? Z

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Schema Refinement

Schema Refinement. Chapter 19 (part 1) Functional Dependencies. The Evils of Redundancy. Redundancy is at the root of several problems associated with relational schemas: redundant storage, insert/delete/update anomalies Main refinement technique: decomposition

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THIRD NORMAL FORM (3NF)

THIRD NORMAL FORM (3NF). A relation R is in BCNF if whenever a FD X ?A holds in R, one of the following statements is true: X?A is a trivial FD, or X is a superkey, or A is part of some key. Why 3NF? .

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Lecture 18 of 42

Lecture 18 of 42. More Normal Forms Notes: JSP, MP4; Applications of Normalization. Monday, 13 October 2008 William H. Hsu Department of Computing and Information Sciences, KSU KSOL course page: http://snipurl.com/va60 Course web site: http://www.kddresearch.org/Courses/Fall-2008/CIS560

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