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...
Consider a water-to-water counter-flow heat exchanger with these specifications. Hot water enters at 95°C while cold water enters at 20°C. The exit temperature of hot water is 15°C...
Does the contractor have a good working relationship with the architect, material suppliers, electricians, plumbers, carpenters, and other personnel needed for the project?
a. Identify the main determinants for valuation of feature films, television programs, and general release feature productions by Columbia Pictures. b. Are the bases of valuation reasonable? Explain....
Fund Financial Statements O a. Include year-end balances and results of activiels for the GCA and GLTI. in Interneal Service Fund totals Ob. Do not include Agency Funds Oc Require reconciliations to...
Samuel maintains a full set of accounting records including a three column cash book. He provided the following information for October 205. Oct 1 Cash $110, bank $5,150 (debit) Trade receivables ...
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.
Prevention Alarm Systems Company purchased a computer for $1,120. It has an estimated useful life of four years and an estimated residual value of $120. Compute the depreciation charge for each of...
Finding Confidence Intervals. In Exercises 9-16, assume that each sample is a simple random sample obtained from a population with a normal distribution. Professor Evaluation Scores Listed below are...
Pacifico Company, a U . S . - based importer of beer and wine, purchased 1 , 7 0 0 cases of Oktoberfest - style beer from a German supplier for 4 5 9 , 0 0 0 euros. Relevant U . S . dollar exchange...
7.C. a. When you add two vectors you get another vector: yes or no? b. When you subtract two vectors you get another vector: yes or no? c. Given the coordinate system below where increasing numbers...
Problem 1 At a given instant, the position of a plane at A and a train at B are measured relative to a radar antenna at O. Determine the distance d between A and B at this instant. To solve the...
The Bell-Boeing V-22 Osprey tiltrotor is both an airplane and a helicopter. It's advantage is the ability to rotate its engines and rotors to vertical position for take-off, landings, and helicopter...
Define cash provided (used) by operating activities, and differentiate this dollar amount from net income, which appears on the income statement.
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...
Which of the following statements is not true regarding the $500 credit for dependent other than a qualifying child credit. Cannot be claimed on the same tax return if the child tax credit is also...
Grind Co. is considering replacing an existing machine. The new machine is expected to reduce labor costs by $127,000 per year for 5 years. Depreciation on the new machine is $57,000 compared with...
If John invested $20,000 in a stock paying annual qualifying dividends equal to 4% of his investment, what would the value of his investment be 5 years from now? Assume Johns marginal ordinary tax...

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