Show that, if only left-deep join trees are considered, as in the System R optimizer, the time

Question:

Show that, if only left-deep join trees are considered, as in the System R optimizer, the time taken to find themost efficient join order is around n2n.Assume that there is only one interesting sort order.

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For book-img-for-question

Database System Concepts

ISBN: 978-0072554816

4th Edition

Authors: Henry F. Korth, S. Sudarshan

See More Books

Question Posted: Jan 29, 2011 01:42 AM

See More Questions

5. (iv) (v) Solve the following initial value problems using Laplace transformations: y" - y': = cos 2t + cos(2t 12)u(t), y(0) -4, y'(0) = 0. y" + 3y' + 2y = g(t), y(0) = 0, y'(0) = 2 where g(t) = =...
Show that there is no comparison sort whose running time is linear for at least half of the n! input of length n. What about a fraction of 1/n of the inputs of length n? What about a fraction 1/2n?
There are four basic operations on red-black trees that perform structural modifications: node insertions, node deletions, rotations, and color modifications. We have seen that RB-INSERT and...
The Depression Anxiety Stress Scales (DASS) is a tool to measure the depression, anxiety and stress levels of individuals. For measuring the stress level, the DASS score ranges from 0 to 42 and a...
Golden Sun Bakery mass-produces bread using three sequential processing departments: Mixing, Baking, and Packaging. The following transactions occurred during April: 1. Direct materials used in the...
Ingram Office Supplies, Inc., buys on terms of 2/15, net 50 days. It does not take discounts, and it typically pays on time, 50 days after the invoice date. Net purchases amount to $800,000 per year....
Find a value of the standard normal random variable z, call ~t zo, such that a. P(z 5 z,,) = ,2090 b. P(z 5 zo) = .7090 C. P(-zo 5 z < zo) = .8472 d. P(-z,, 5 z 5 z,,) = .I664 e. P(z,, 5 z 5 0) =...
1. What alternative ways of providing systems support in Mexico did Collins consider? 2. What were the major issues that Collins faced when deciding what to do about systems support in Mexico? 3. To...
Please Help! I am so confused. This assignment will focus on your shadow corporation. You will be asked to utilize the latest SEC 1 0 - K filing. To Do 1 . Go to the SEC's website ( www . sec . gov )...
Consider the structure of the azo dye called alizarine yellow R (below). Show the reagents you would use to prepare this compound via an azo coupling process. .N. N' O2N
Show that the lowest-cost join order can be computed in time O(3n). Assume that you can store and look up information about a set of relations (such as the optimal join order for the set, and the...
A set of equivalence rules is said to be complete if, whenever two expressions are equivalent, one can be derived from the other by a sequence of uses of the equivalence rules. Is the set of...
Why do financial intermediaries exist? What services do they provide to the public? Are all financial institutions financial intermediaries?
Find the explained variation for the paired data. The equation of the regression line for the paired data below is y = 5.18286 + 3.33937x. X 972 23 34 4 22 17 y 43 35 16 21 23 102 81
5. The vertical stress at a point is 28 kPa, while the horizontal stress is 14 kPa. shear stress on the horizontal plane is +4 kPa. The (a) Draw the Mohr's circle of stress and show the pole point...
I need assistance with the below questions for my HIM 5370 at texas State University Case Mix Table: 4. Complete the Case Mix table shown below. Calculate the case mix for each month. The table below...
The probability that a printing press will print a book with no errors is 78%. The company is about to process an order of 30 books. Round decimals to 3 places or percentages to 1 decimal place. 9....
alculate Product Costs, using JOB COSTING SYSTEM. Please SHOW CALCULATION. Dream Chocolate Company: Choosing a Costing System TABLE 1 Typical Prices and Costs of Chocolate 641 1.25 oz. Bar 3.0 oz....
19.17A Gospodin Grimshaw Limited manufactures hiking boots for sale which it sells principally in Russia and other parts of eastern Europe. Each pair of boots sells for 15. Variable costs are 5.50...
According to a New York Times columnist, The estate tax affects a surprisingly small number of people. In 2003, . . . just 1.25 percent of all deaths resulted in taxable estates, with most of them...
Explain the relationship between organizationperson fit and culture.
Describe the type(s) of relationship(s) between EMPLOYEE and STORE.
Draw the ERD to show the relationships among EMPLOYEE, STORE, and REGION.
Create the relational diagram to show the relationships among EMPLOYEE, STORE, and REGION.
Which of the following are elements of a bootstrappable business model? Indicate ALL that apply. Large up-front capital investment Recurring revenue stream Long sales cycles Word of mouth advertising
Hooligan Adventure Supply produces and sells various outdoor equipment. The Molding and Assembly production departments are supported by the Personnel and Maintenance departments. Personnel costs are...
Kelley Enterprises In October 1989, Pat Kelley.wus in his office, preparing the 1990 budget and contemplating the recent races of his business. Orders had been plentiful Lately that he though that...

Show that, if only left-deep join trees are considered, as in the System R optimizer, the time

Question:

Step by Step Answer:

The derivation of time taken is similar to the general ...View the full answer

Database System Concepts

Students also viewed these Computer Sciences questions