Explain the phantom phenomenon. Why may this phenomenon lead to an incorrect concurrent execution despite the use

Question:

Explain the phantom phenomenon. Why may this phenomenon lead to an incorrect concurrent execution despite the use of the two-phase locking protocol?

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

Explain the term no blocking protocol and explain why two-phase commit protocol is not a non-blocking protocol
Explain why absorption costing and marginal costing may lead to different measures of profit in a period?
Excel A1 File 2 8 0 9 McGraw Hill Excel Question - Saved Home Insert Draw X A < Cash Accounts receivable Office supplies Office equipment 10 Land 11 Accounts payable 12 Common stock 13 Cash...
Consider an investor's choice of a farm unit in the Corn Belt, one in the California Central Valley, or the one in the Great Plains region. An investor added these three assets in one portfolio. The...
Albertson's Fine Furnishings manufactures upscale custom furniture. Albertson's currently uses a plant wide overhead rate, based on direct labor hours, to allocate its $1,100,000 of manufacturing...
A firm generated $220 million in free cash flow. It paid out $35 million in dividends and there were no share issues or repurchases. It incurred $6 million in net interest expense (after tax). The...
Discuss the distinctions among negligent torts, intentional torts, and strict liability.
On January 1, 2012, the Eugene Company ledger shows Equipment $36,000 and Accumulated Depreciation $13,600. The depreciation resulted from using the straight line method with a useful life of 10...
Beginning Investment in the business: The owner of the company has invested $18,000 cash into the business. This increases the assets of the business from its zero balance. Owner's equity also...
Refer to the preceding facts for Postmans acquisition of 80% of Spartans common stock and the bond transactions. Postman uses the simple equity method to account for its investment in Spartan. On...
If deadlock is avoided by deadlock avoidance schemes, is starvation still possible? Explain your answer.
Devise a timestamp-based protocol that avoids the phantom phenomenon.
Study the following Excel multiple regression output. How many predictors are in this model? How many observations? What is the equation of the regression line? Discuss the strength of the model in...
A market research analyst reviews the results of married people in a taste test of a popular high energy drink. Husband Prefers Husband Does not Prefer O 0.88 0.27 O 0.12 0.58 Wife Prefers 0.39 .12...
Brandon enters into a contract with Karen on Cora's behalf. An agency consists of Relationships between principal and agent, agent and third party, and principal and third party A relationship...
The charge on one plate of a capacitor is + 60 nC and the charge on the other plate is - 60 nC. If the potential difference between the plates is 350 Volts, what is the capacitance of the capacitor?...
Rank in order, from largest to smallest, the accelerations a-acat points A-C. 0 A B C A) a aB ac B) a C) a B D) acaA E) ac> aB a A > ac > AB ac > AB a
You can afford a $1100 per monthly mortgage payment. You've found a 30-year loan at 7% interest. Use the TVM Solver on the TI calculator. Round to the nearest cent (two decimal places). (a) How large...
As The New York Times reported, Every day, on average, a scientific paper is retracted because of misconduct. Two percent of scientists are willing to admit that they have manipulated their data to...
Ann hires a nanny to watch her two children while she works at a local hospital. She pays the 19 year-old nanny $125 per week for 48 weeks during the current year. a. What is the employers portion of...
This case deals with an airline company that, in the aftermath of 9/11 decided that it needed to retain and increase its market share as well as improve the morale of its front line employees. It...
Write the SQL code that will create the table structure for a table named EMP_1. This table is a subset of the EMPLOYEE table. The basic EMP_1 table structure is summarized in the table below.
Write the SQL code to change the job code to 501 for the person whose employee number (EMP_NUM) is 107. After you have completed the task, examine the results, and then reset the job code to its...
Write the SQL code to create a copy of EMP_1, naming the copy EMP_2. Then write the SQL code that will add the attributes EMP_PCT and PROJ_NUM to its structure. The EMP_PCT is the bonus percentage to...
Max Warrie, a famous former Australian cricketer had agreed to play at the Sydney Cricket Ground in an exhibition match against a rest of the world team in the coming Australian summer. He was to be...
Does a creditor have an obligation to advise a company to obtain legal advice before signing a contract? In this case, a director of a company is saying they did not know what they were signing when...
Randal embezzled $6000 of his employer's money and then disappeared. The employer's accountant called at Randal's residence and found out that his wife had a $3500 term deposit. When the accountant...

Explain the phantom phenomenon. Why may this phenomenon lead to an incorrect concurrent execution despite the use

Question:

Step by Step Answer:

The phantom phenomenon arises when due to an insertion or deletion two transactions logic...View the full answer

Database System Concepts

Students also viewed these Computer Sciences questions