Answered: Given the following query, which is…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Given the following query, which is represented by a relational algebra expression:
Project[Books.Title, Borrow.Date](
Select( Books.publisher="Springer",
Join( Books,Rental,Books.kid=Rental.kid ))
It assumes that we have a defined B+ tree index on the key Borrow.kid. All tables are arranged by key. Our database management system uses the following algorithms to implement contacts:
a) contact with a nested loop by blocks (rows),
b) contact with nested loop and index and
c) contact with sorting and merging.
Which contact implementation algorithm reads the fewest blocks from disk? You can only make a rough estimate of the blocks read for the given algorithms.

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