EBK ORACLE 12C: SQL
3rd Edition
ISBN: 9781305465305
Author: CASTEEL
Publisher: YUZU
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also provide the number of moves(actions) made at state A and moves(actions) made state B. INCLUDE Java program required(this question is not graded)
You are given a class that processes purchases for an online store. The class receives calls to:
•
Retrieve the prices for items from a database
• Record the sold items
•
Update the database
•
Refresh the webpage
a. What architectural pattern is suitable for this scenario? Illustrate your answer by drawing a
model for the solution, showing the method calls/events.
b. Comment on how applying this pattern will impact the modifiability of the system.
c. Draw a sequence diagram for the update operation.
2. The memory management has contiguous memory allocation, dynamic partitions,
and paging. Compare the internal fragmentation and external fragmentation for
these three approaches. [2 marks]
3. Suppose we have Logical address space = 24 = 16 (m = 4), Page size=2² =4 (n = 2),
Physical address space = 26 = 64 (r = 6). Answer the following questions: [4 marks]
1) Total # of pages ?
2) Total # of frames ?
3) Number of bits to represent logical address?
4) Number of bits to represent offset ?
5) Number of bits to represent physical address?
6) Number of bits to represent a page number?
7) Number of bits to represent a frame number /
4. What is translation look-aside buffers (TLBS)? Why we need them to implement the
page table? [2 marks]
5. Why we need shared pages for multiple processes? Give one example to show the
benefits. [2 marks]
6. How to implement the virtual memory by using page out and page in? Explain with
an example. [2 marks]
7. We have a reference string of referenced page…
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- 8. List three HDD scheduling algorithms. [2 marks] 9. True or False? The NVM has the same scheduling algorithms with HDD. Explain why? [2 marks] 10. Why the modern mouses use polling to detect movements instead of interrupts? [2 marks] 11. What is thrashing? How does it happen? [2 marks] 12. Given a reference string of page numbers 7, 0, 1, 2, 0, 3, 0, 4, 2, 3, 0, 3, 0, 3, 2, 1, 2, 0, 1, 7, 0, 1 and 4 frames show how the page replacement algorithms work, and how many page faults? [6 marks], 1) FIFO algorithm? [2 marks] 2) Optimal algorithm? [2 marks] 3) LRU algorithm? [2 marks] 13. List at least three file systems that you know. [2 marks] 14. In C programming, how the seek to a specific position in the file by offset? [2 marks]arrow_forwardA Personal Address Book application program allows the user to add, delete, search, save, and load contact information. The program separates the user interface (command-line) and the internal processing subsystem. The internal processing system consists of the following classes: • • Contact Manager (responsible for add and delete operations) Contact Finder (responsible for the search operation) pataManager (responsible for save and load operations) a. What design pattern can be used to implement the user interface? Explain your answer using a class diagram for the entire system. b. Draw a UML sequence diagram to show the behavioral view of the Personal Address Book program, demonstrating what happens when a user enters new contact information.arrow_forwardA system comprises three components: A, B, and C. Calling A requires calling B, and calling B requires calling A. Component C is responsible for dissimilar tasks T#1, #2, and T#3. a. Comment on the modifiability of this system. What problems do you see in this system, and how would you solve them? b. Suppose that T#1 is performed by both component A and C. What does this indicate about A and C? How would you solve this problem?arrow_forward
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