What is the optimum join ordering and its cost

Assignment Help Basic Computer Science

Reference no: EM131212765

Consider the join of relations R(a,b), S(b,c), T(c,d), and U(a,d), where R and U each have 1000 tuples, while S and T each have 100 tuples. Further, there are 100 values of all attributes of all relations, except for attribute c, where V(S,c) = V{T,c) - 10.

a) What is the order selected by the greedy algorithm? What is its cost?

b) What is the optimum join ordering and its cost?

Reference no: EM131212765

Questions Cloud

Prepare a production budget and manufacturing budget : Prepare a production budget. Ensure the accuracy of your data. Prepare a manufacturing budget. Ensure the accuracy of your data. Prepare a selling expense budget. Ensure the accuracy of your data.

Evaluating the entire expression : Make whatever assumptions you wish about the number of available main-memory buffers and the sizes of relations mentioned in E and F.

Factors contributed to failure of thai governments plan : In 2008 India and Vietnam restricted their rice exports to prevent increases in their domestic rice prices, and world rice prices temporarily tripled.- What factors probably contributed to the failure of the Thai government's plan?

High degree of connectedness : With so many ways to stay connected (e-mail, voice mail, text messaging, and so on) and with many people feeling overwhelmed because of this high degree of connectedness, what are some ways to give yourself a break from always being on call while ..

What is the optimum join ordering and its cost : What is the order selected by the greedy algorithm? What is its cost?

Components of business and functions : Which are the main components of business and their functions? Anyone to help? Please add two credible references and be straight to the point. I will have to do some comparisons with other student answer. No plagialism please.

Express the following conditions about the cost of implement : It is better to use index-scan with a non clustering index on x and a term that equates x to a constant than a clustering index on y and a term of the form y > C for some constant C.

Federal appeals court overrules fcc on indenency : Although the First Amendment generally prevents the U.S. government from engaging in censorship, an exception exists for broadcast radio and television.

What are advantages of allowing customers to make purchases : What are the signs you would look out for in the financial statements for the possibility of bad debts? What are the advantages and disadvantages of allowing customers to make purchases on credit? Give reasons for your answers.

User Account

All Pages