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Database Management Systems (2) Assignment 2 A. Consider a relation R over the attributes a, b, c with the following characteristics: R has 5,000 records with 5 records per page Attribute a is a primary key Un-clustered B+ (n=5) tree index on attribute a Clustered B+ (n=5) tree index on attribute b Attribute b has 1,000 distinct values in R, and the values are uniformly distributed in R Attribute c has 500 distinct values uniformly distributed in R, and an un-clustered B+ (n=5) tree index (a) Estimate the cost of computing select * from R where a=constant_value using the index (b) Estimate the cost of computing select * from R where b=constant_value using the index (c) Estimate the cost of computing select * from R where a=constant_value using the index

Database Management Systems (2) Assignment 2 A. Consider a relation R over the attributes a, b, c with the following characteristics: R has 5,000 records with 5 records per page Attribute a is a primary key Un-clustered B+ (n=5) tree index on attribute a Clustered B+ (n=5) tree index on attribute b Attribute b has 1,000 distinct values in R, and the values are uniformly distributed in R Attribute c has 500 distinct values uniformly distributed in R, and an un-clustered B+ (n=5) tree index (a) Estimate the cost of computing select * from R where a=constant_value using the index (b) Estimate the cost of computing select * from R where b=constant_value using the index (c) Estimate the cost of computing select * from R where a=constant_value using the index

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Database Management Systems (2) Assignment 2 A. Consider a relation R over the attributes a, b, c with the following characteristics: R has 5,000 records with 5 records per page Attribute a is a primary key Un-clustered B+ (n=5) tree index on attribute a Clustered B+ (n=5) tree index on attribute b Attribute b has 1,000 distinct values in R, and the values are uniformly distributed in R Attribute c has 500 distinct values uniformly distributed in R, and an un-clustered B+ (n=5) tree index (a) Estimate the cost of computing select * from R where a=constant_value using the index (b) Estimate the cost of computing select * from R where b=constant_value using the index (c) Estimate the cost of computing select * from R where a=constant_value using the index
Transcribed Image Text:Database Management Systems (2) Assignment 2 A. Consider a relation R over the attributes a, b, c with the following characteristics: R has 5,000 records with 5 records per page Attribute a is a primary key Un-clustered B+ (n=5) tree index on attribute a Clustered B+ (n=5) tree index on attribute b Attribute b has 1,000 distinct values in R, and the values are uniformly distributed in R Attribute c has 500 distinct values uniformly distributed in R, and an un-clustered B+ (n=5) tree index (a) Estimate the cost of computing select * from R where a=constant_value using the index (b) Estimate the cost of computing select * from R where b=constant_value using the index (c) Estimate the cost of computing select * from R where a=constant_value using the index
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