EPACK DATABASE SYSTEMS WITH LOOSELEAF
13th Edition
ISBN: 9780357475171
Author: Coronel
Publisher: CENGAGE L
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Chapter 5, Problem 6P
Explanation of Solution
Crow’s Foot ER diagrams for Tiny College IT Staffing Solution:
The following data model shows the solution for the given question.
Explanation:
- In the above data model, the overlapping constraint (o) is used as a category symbol. Here the “Employee” supertype entity has optional subtype entity. The primary of “Employee” entity is “Emp_No”.
- The “Professor”, “Staff” and “Admin” are the subtype entities...
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Students have asked these similar questions
Question D.4: FIFO Page Replacement
Consider the following page reference string:
e, c, b, e, a, g, d, c, e, g, d, a
Considering 4 frames, fill in the following table and then answer how many page faults would occur with the
FIFO page replacement algorithm.
RS: reference string; FO: frame 0, F1: frame 1, etc.
Hint: all frames are initially empty, so your first unique pages will all cost one fault each.
Time
1234567891011
12
RS
e
cb
e agd ce g d
a
FO
F1
F2
F3
Page fault?
b) Total # page faults:
c) Briefly (1-2 sentences) explain Belady's Anomaly that can occur in FIFO Page Replacement.
Consider a system that uses a fixed-partition scheme, with equal partitions of size 2" bytes, and the main
memory has 2¹8 bytes. A process table is maintained with a pointer to the resident partition for each resident
process. How many bits are required for the pointer in the process table? Show all your steps.
Use the same semaphore notation shown above to describe how we can ensure the execution order of the
following process execution graph:
P6
P2
P7
P1
P3
P4
P5
Use all of the following semaphores in your answer:
s1=0; s2=0; s3=0; s4=0; s5=0; s6=0;
Chapter 5 Solutions
EPACK DATABASE SYSTEMS WITH LOOSELEAF
Ch. 5 - Prob. 1RQCh. 5 - What kinds of data would you store in an entity...Ch. 5 - Prob. 3RQCh. 5 - What is a subtype discriminator? Give an example...Ch. 5 - Prob. 5RQCh. 5 - What is a disjoint subtype? Give an example.Ch. 5 - What is the difference between partial...Ch. 5 - Prob. 8RQCh. 5 - According to the data model, is it required that...Ch. 5 - Prob. 10RQ
Ch. 5 - Prob. 11RQCh. 5 - Prob. 12RQCh. 5 - Prob. 13RQCh. 5 - Prob. 14RQCh. 5 - When implementing a 1:1 relationship, where should...Ch. 5 - What is time-variant data, and how would you deal...Ch. 5 - Prob. 17RQCh. 5 - Prob. 1PCh. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - Prob. 4PCh. 5 - Prob. 5PCh. 5 - Prob. 6PCh. 5 - Prob. 7PCh. 5 - Prob. 8CCh. 5 - Prob. 9CCh. 5 - Prob. 10C
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- Process Allocation A Max BCDABC D A Available B C PO 3 0 2 1 4 2 4 2 1 0 0 P1 0 1 0 1 0 2 2 2 P2 1 2 0 0 3 2 1 0 P3 0 1 1 2 1 1 1 2 P4 0 0 1 1 1 - 0 2 1 a) What is the content of the matrix Need? Process PO P1 P2 P3 P4 A Need BC D D ° b) Is the system in a safe state? If yes, give a safe sequence of processes. If not, explain why the system is not in a safe state. c) If a request from process P4 arrives for (1,0,0,0), can the request be granted immediately? Please state the reason.arrow_forwardConsider N processes sharing the CPU in a round-robin fashion (N>=2). Assume that each context switch takes S ms and that each time quantum is Q ms. For simplicity, assume that processes never block on any event and simply switch between the CPU and the ready queue. Also, assume that a process is still in the ready queue while a context switch is happening. a) What happens if Q is much smaller than S? What happens when Q→→ ∞, i.e. is much larger than the maximum turnaround time of all the processes? Be brief (1-2 sentences max) in your answer. b) If you use RR for scheduling, which of the three performance metrics (waiting, response, turnaround time) is more likely to be improved? Why (1-2 sentences max)?arrow_forwardCompute the jackknife estimate of bias and standard error for the correlation statistics from the law82 data using r languagearrow_forward
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