Below is a schedule of operations for two transactions that are executed within a database system....
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
Below is a schedule of operations for two transactions that are executed within a database system. (a) Explain the problem that will occur if transaction A fails and (b) describe a concurrency control technique that a DBMS should implement to avoid this problem. Transaction A read_item(X); X:= X-N; write_item(X); read_item(Y); Transaction B read_item(X); X:=X+M: write_item(X); Below is a schedule of operations for two transactions that are executed within a database system. (a) Explain the problem that will occur if transaction A fails and (b) describe a concurrency control technique that a DBMS should implement to avoid this problem. Transaction A read_item(X); X:= X-N; write_item(X); read_item(Y); Transaction B read_item(X); X:=X+M: write_item(X);
Expert Answer:
Answer rating: 100% (QA)
a The problem that will occur if transaction A fails is that the value of X will be lost This is bec... View the full answer
Related Book For
Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
Posted Date:
Students also viewed these databases questions
-
Alyeski Tours operates day tours of coastal glaciers in Alaska on its tour boat the Blue Glacier. Management has identified two cost drivers-the number of cruises and the number of passengers-that it...
-
A homogeneous wire with a mass per unit length of 1.8 kg/m is used to form the figure shown. Determine the mass products of inertia Ixy, Iyz, and Izx of the wire figure. 0.5 m 0S m OS m
-
Determine the moment of the force F about point O. Express the result as a Cartesian vector. F = (-6i + 4 j+ 8k} kN A 4 m 6 m 3 m y 1 m 2 m
-
Suppose \(x\) is a linked-list Node. What is the effect of the following code fragment? \[x \cdot \text { next }=x \cdot \text { next } . \text { next; }\]
-
Calculate the value 1. C(18, 16) 2. C(25, 24) 3. 4. 5. 9. 2) (G) .3.
-
How does machine design contribute to either increasing or alleviating the maintenance problem?
-
Why might an auditor elect to perform only limited or no tests of controls for fixed assets?
-
Mississippi Company has two decentralized divisions, Illinois and Iowa. Illinois always has purchased certain units from Iowa at $60 per unit. Because Iowa plans to raise the price to $80 per unit,...
-
Discuss the various Inter-Process Communication (IPC) mechanisms such as message queues, shared memory, and pipes. What are the use cases and advantages of each, and how do they ensure...
-
You are required to submit a report that explains with a sufficient level of detail how the results are obtained. Also, you need to submit your codes (if any). Everything should be submitted on BB in...
-
Show that 2-3j -4k and -4i + 6k-8k are parallel. d) IfT; R. R defined by T(x,y,z) = 2x +4Z, x + 5y-6z.Show that; T is linear
-
Gainesville Corporation's income statement revealed sales of \($700\),000; gross profit of \($300\),000; selling and administrative costs of \($140\),000; and income taxes of \($45\),000. The selling...
-
Gainesville Corporation's income statement revealed sales of \($700\),000; gross profit of \($300\),000; selling and administrative costs of \($140\),000; and income taxes of \($45\),000. The selling...
-
Giving justifications for all your decisions, advise the marketing team at the Hotel Pillowmint on all aspects of metrics and analytics covered in this chapter. Alternatively, conduct the same...
-
Take a poll of friends, family, and work colleagues by asking them the foUowing three questions: a. Do you think that real estate is a safer investment than bonds? b. Do you think of your house as an...
-
Use your favorite search engine to do a search on life cycle funds. Read several of the articles that you find and prepare a short report on why life cycle funds have become so popular. Also do some...
-
Assume DEF Co plans to pay $23,958 for a new machine that will generate cash flows of $6,000 for five years. Also assume DEF pays 10% for its cost of capital. a. What is DEF's IRR? Should this...
-
Floyd Distributors, Inc., provides a variety of auto parts to small local garages. Floyd purchases parts from manufacturers according to the EOQ model and then ships the parts from a regional...
-
a. Wilson filed his individual tax return on the original due date, but failed to pay $700 in taxes that were due with the return. If Wilson pays the taxes exactly 2 months late, calculate the amount...
-
Marty is a sales consultant. Marty incurs the following expenses related to entertainment of his clients in 2012: Dues to a country club......................................................$4,500...
-
How are qualified dividends taxed in 2012? Please give the two rates of tax which apply to qualified dividends, and specify when each of these rates applies._________________________...
-
The shaft consists of a solid segment \(A B\) and a hollow segment \(B C\), which are rigidly joined by the coupling at \(B\). If the shaft is made from A-36 steel, determine the maximum torque \(T\)...
-
The state of plane stress at a critical point in a steel machine bracket is shown. If the yield stress for steel is \(\sigma_{Y}=36 \mathrm{ksi}\), determine if yielding occurs using the maximum...
-
If \(\sigma_{Y}=50 \mathrm{ksi}\), determine the factor of safety for this state of stress against yielding, based on (a) the maximum shear stress theory and (b) the maximum distortion energy theory....
Study smarter with the SolutionInn App