The following query is written in relational algebra. Project[Deposit.aid,Deposit.amount]( Select[Deposit.amount>=10000]( Join[aid=aid](Account,Deposit))) Our database system includes the implementation of B+ tree indexes solely. Assume we have indexes on primary keys of tables and an index on Deposit.amount. Which join algorithm reads less number of pages from the disk: sort-merge join or index nested loops join?
The following query is written in relational algebra. Project[Deposit.aid,Deposit.amount]( Select[Deposit.amount>=10000]( Join[aid=aid](Account,Deposit))) Our database system includes the implementation of B+ tree indexes solely. Assume we have indexes on primary keys of tables and an index on Deposit.amount. Which join algorithm reads less number of pages from the disk: sort-merge join or index nested loops join?
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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The following query is written in relational algebra.
Project[Deposit.aid,Deposit.amount](
Select[Deposit.amount>=10000](
Join[aid=aid](Account,Deposit)))
Our
have indexes on primary keys of tables and an index on Deposit.amount.
Which join
nested loops join?
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