have 3), 5(2 (A, E) and the size (i.e., the number of rows) of each relation is as follows: TR = 1000, rs = 3000, TT= 4000, TU = 2000. so, assume that all attributes of the relations are of the same length and we use hash join, so the st of joining X € {R, S, T, U} and Y = {R, S, T, U} is approximately: k(rx.cx+ry.cy) here k is a constant, rx and cx denote the number of rows and the number of columns of , respectively, and ry and cy denote the number of rows and the number of columns of Y. nally, assume that the size of a join is always 0.2% of the size of the cross product (i.e., TXY = 02. TX.TY). Under the above assumptions, find the lowest cost plan for computing R▷ S▷ T▷ U using mamic programming and left-deep join trees. You need to complete the following table while ding the best plans (e.g., in the form of ((□ □) □) □ in the last line) and associated costs. Cost Subquery RAS RAT RAU SAT SAU TAU RASAT RASAU RATAU SAT U BAS TAU Size Best Plan 6000 8000k (1000-2 +3000 - 2)k] || R&S

have 3), 5(2 (A, E) and the size (i.e., the number of rows) of each relation is as follows: TR = 1000, rs = 3000, TT= 4000, TU = 2000. so, assume that all attributes of the relations are of the same length and we use hash join, so the st of joining X € {R, S, T, U} and Y = {R, S, T, U} is approximately: k(rx.cx+ry.cy) here k is a constant, rx and cx denote the number of rows and the number of columns of , respectively, and ry and cy denote the number of rows and the number of columns of Y. nally, assume that the size of a join is always 0.2% of the size of the cross product (i.e., TXY = 02. TX.TY). Under the above assumptions, find the lowest cost plan for computing R▷ S▷ T▷ U using mamic programming and left-deep join trees. You need to complete the following table while ding the best plans (e.g., in the form of ((□ □) □) □ in the last line) and associated costs. Cost Subquery RAS RAT RAU SAT SAU TAU RASAT RASAU RATAU SAT U BAS TAU Size Best Plan 6000 8000k (1000-2 +3000 - 2)k] || R&S

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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