Answered step by step
Verified Expert Solution
Question
1 Approved Answer
For the four relations in the following table, find the best join order according to the dynamic programming algorithm used in System-R. You should give
For the four relations in the following table, find the best join order according to the dynamic programming algorithm used in System-R. You should give the dynamic programming table entries for evaluate the join orders. Assume that the cost of each join is the size of its intermediate result. Suppose that we are only interested in left-deep join trees and join trees without Cartesian products. Note that you should use the System-R optimizer formula to compute the size of each join output. R(A,B,C) S(B,C) TR-4000 | T(S)=3000 | T(W)-2000 | TU-1000 VR.A) =100 V(R,B) =200 | V(S,B) =100 | V(W,B) =100 V(R,C)-100 V(S,C)-300 U(A,D) V(U,A) =100 V(W.D)-50 V(U,D)-100 For the four relations in the following table, find the best join order according to the dynamic programming algorithm used in System-R. You should give the dynamic programming table entries for evaluate the join orders. Assume that the cost of each join is the size of its intermediate result. Suppose that we are only interested in left-deep join trees and join trees without Cartesian products. Note that you should use the System-R optimizer formula to compute the size of each join output. R(A,B,C) S(B,C) TR-4000 | T(S)=3000 | T(W)-2000 | TU-1000 VR.A) =100 V(R,B) =200 | V(S,B) =100 | V(W,B) =100 V(R,C)-100 V(S,C)-300 U(A,D) V(U,A) =100 V(W.D)-50 V(U,D)-100
Step by Step Solution
There are 3 Steps involved in it
Step: 1
Get Instant Access to Expert-Tailored Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started