The following query is given as an expression of relational algebra. Project[Account.aid,Transfer.to_aid]( Join[Account.aid=Transfer.from_aid]( Select[amount>1000000](Transfer), Account)) All tables have a hash-based index defined on the keys. Assume that we have a B+ tree defined on Transfer.amount and a hash index on Transfer.from_aid. Assume also that our DBMS implements two join algorithms: a) the index nested loops join, and b) the hash join? Determine a query evaluation plan that reads the least number of blocks from the disk. Justify your solution. You can use rough estimations!
The following query is given as an expression of relational algebra. Project[Account.aid,Transfer.to_aid]( Join[Account.aid=Transfer.from_aid]( Select[amount>1000000](Transfer), Account)) All tables have a hash-based index defined on the keys. Assume that we have a B+ tree defined on Transfer.amount and a hash index on Transfer.from_aid. Assume also that our DBMS implements two join algorithms: a) the index nested loops join, and b) the hash join? Determine a query evaluation plan that reads the least number of blocks from the disk. Justify your solution. You can use rough estimations!
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[Account.aid,Transfer.to_aid](
Join[Account.aid=Transfer.from_aid](
Select[amount>1000000](Transfer),
Account))
All tables have a hash-based index defined on the keys. Assume that we have a B+ tree
defined on Transfer.amount and a hash index on Transfer.from_aid.
Assume also that our DBMS implements two join
join, and b) the hash join?
Determine a query evaluation plan that reads the least number of blocks from the disk.
Justify your solution. You can use rough estimations!
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