Question: The indexed nested-loop join algorithm described in Section 13.5.3 can be inefficient if the index is a secondary index, and there are multiple tuples with

The indexed nested-loop join algorithm described in Section 13.5.3 can be inefficient if the index is a secondary index, and there are multiple tuples with the same value for the join attributes. Why is it inefficient? Describe a way, using sorting, to reduce the cost of retrieving tuples of the inner relation. Underwhat conditions would this algorithm be more efficient than hybrid merge–join? Discuss.

Step by Step Solution

★★★★★

3.44 Rating (173 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

We can store the entire smaller relation in memory r... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

16-CS-DB (296).docx

120 KBs Word File

Students Have Also Explored These Related Databases Questions!

The twos complement integer division algorithm described in Section 9.3 is known as the restoring method because the value in the A register must be restored following unsuccessful subtraction. A...

The nearest-neighbor algorithm described in Section 5.2 can be extended to handle nominal attributes. A variant of the algorithm called PEBLS (Parallel Examplar-Based Learning System) by Cost and...

The Levinson-Durbin algorithm described in section 11.3.1 solved the linear equations ? m a m? = ? ? m where the right-hand side of this equation has elements of the autocorrelation sequence that are...

I Question 2: We discussed the merge-join algorithm for an equi-join r Nr. A=s.B s, when both relations are sorted in ch12.pptx. The pseudo code is shown in the slide 12.32 in ch12.pptx and discussed...

Introduction Note: Circular Buffers are described in Section 5.2.4 of our textbook (p. 211). Please read that section before proceeding. An interesting, relatively straightforward data structure is...

In this write up, the following should be covered: What is the primary issue facing the firm? What are the secondary issues facing the firm? What is the most appropriate action for the firm? What...

Assume the cash was received in the last accounting period. If the adjusting entry to record revenue earned during the current period is not record A. liabilities will be understated Bassets will be...

Lesson 12 Quiz (Show/Explain all Work) IST 230 Relations on Sets, Databases 1. Let A = {0, 1, 2, 3, 4, 5, 6, 7, 8} and B = {1, 2, 3, 4, 5, 6, 7, 8}. Now let R be a binary relation R from A to B such...

Let A, B be sets. Define: (a) the Cartesian product (A B) (b) the set of relations R between A and B (c) the identity relation A on the set A [3 marks] Suppose S, T are relations between A and B, and...

V Ltd was established on 1 July 2018 with share capital of $132 000. One year later the statement of comprehensive income and statement of financial position were as follows: Statement of...

Topic: The performance of a trading strategy with futures, options, and/or cash assets Content: 1. Choose a particular technical or fundamental framework for trading options, futures, or underlying...

Re - evaluate the planned expansion example discussed in the lecture using the following revised settings. Please provide step by step answer:

Determine the highest real root of (x) = 0.95x3 5.9x2 + 10.9x - 6: (a) Graphically. (b) Using the Newton-Raphson method (three iterations, xi = 3.5). (c) Using the secant method (three iterations,...

Determine the lowest positive root of (x) = 8 sin(x) e-x 1: (a) Graphically. (b) Using the Newton-Raphson method (three iterations, xi = 0.3). (c) Using the secant method (three iterations, xi-l =...

1. An inventory loss from a market price decline occurred in the first quarter, and the decline was not expected to reverse during the fiscal year. However, in the third quarter, the inventory's...

How can cohesiveness and diversity support group effectiveness?

TAFKAP Industries has three million shares of stock outstanding selling at $17 per share and an issue of $20 million in 7.5 percent, annual coupon bonds with a maturity of 15 years, selling at 106...

Griegs Supermarket is a small western Canada chain of supermarkets that has been in operation for 50 years. The store in the case employs about 150 people, 40% of whom are part-time. The current...

What is sparse data? Give an example.

Define and describe the basic characteristics of a NoSQL database.

What do you understand by the term first normal form?

Give an example of your own of a relation with (a) One relation-valued attribute and (b) Two such attributes. Also, give two more relation that represent the same information as those relations but...

Write an expression that returns true if the current value of the parts relvar P is empty and false otherwise. Do not use the is-empty shorthand.

Table 8.29 has no value labels, so either variable can be interpreted as nominal or ordinal. The inde- pendent variable is the column variable. Use the data to answer the questions below. TABLE 8.29...