Q2. Give the optimal estimate for the disk-IO cost of r JOIN s using (2.a) Sort-merge join, assuming that the two relations are sorted on the join attributes and r’s join attribute is a key for r. (2.b) Block nested loop join Assume r has 2,000 tuples with 20 tuples per block; s has 4,000 tuples with 4 tuples per block; and the main memory buffer for this operation is 22 blocks
Q2. Give the optimal estimate for the disk-IO cost of r JOIN s using (2.a) Sort-merge join, assuming that the two relations are sorted on the join attributes and r’s join attribute is a key for r. (2.b) Block nested loop join Assume r has 2,000 tuples with 20 tuples per block; s has 4,000 tuples with 4 tuples per block; and the main memory buffer for this operation is 22 blocks
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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Q2. Give the optimal estimate for the disk-IO cost of r JOIN s using
(2.a) Sort-merge join, assuming that the two relations are sorted on the join attributes and r’s join attribute is a key
for r.
(2.b) Block nested loop join
Assume r has 2,000 tuples with 20 tuples per block; s has 4,000 tuples with 4 tuples per block; and the main memory
buffer for this operation is 22 blocks
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