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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