The following query is given as an expression of relational algebra. Project[Projects.jid,Projects.name,Orders.price]( Join[Projects.jid=Orders.jid]( Select[budget>500.000](Projects), Select[date>’1/1/2010’](Orders))) All tables have hash indexes defined on keys. We have B+ trees defined for Orders.date and Projects.budget, and a hash index on Orders.jid. Suppose our DBMS includes the implementations of the index nested loops join and the sort-merge join. Find a query plan that reads the least number of blocks from the disk. Write all assumptions.
The following query is given as an expression of relational algebra. Project[Projects.jid,Projects.name,Orders.price]( Join[Projects.jid=Orders.jid]( Select[budget>500.000](Projects), Select[date>’1/1/2010’](Orders))) All tables have hash indexes defined on keys. We have B+ trees defined for Orders.date and Projects.budget, and a hash index on Orders.jid. Suppose our DBMS includes the implementations of the index nested loops join and the sort-merge join. Find a query plan that reads the least number of blocks from the disk. Write all assumptions.
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 given as an expression of relational algebra.
Project[Projects.jid,Projects.name,Orders.price](
Join[Projects.jid=Orders.jid](
Select[budget>500.000](Projects),
Select[date>’1/1/2010’](Orders)))
All tables have hash indexes defined on keys. We have B+ trees defined for
Orders.date and Projects.budget, and a hash index on Orders.jid.
Suppose our DBMS includes the implementations of the index nested loops join and the
sort-merge join. Find a query plan that reads the least number of blocks from the disk.
Write all assumptions.
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