Download INSS 651

INSS 651
Final EXAM
Fall 2007 Data Base Management System
MUST BE DONE INDIVIDUALLY
READ THE INSTRUCTIONS CAREFULLY!!!!!!!!
NO LATE SUBMISSION!!!!!!!
DUE DATE: May 14, 2007
Note:
 This is an EXAM; I can NOT answer any
questions. Please do not ask for any help.
 email me for any general clarifications
 Exam is to be done individually
 Honesty and integrity is expected
 Do not submit anything else.
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1
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Last
First
Total points 50
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Ques #1. Note these are NOT simple T/F answers
Circle the appropriate answer. GIVE REASONS or EXPLANATIONS for correct answers
and if the answer is false explain why and then indicate the correct answer: It is NOT a simple
T/F question each question requires T/F explanation
(10 points)
T
F
1 A data warehouse is a snapshot of an organization at a particular time
T
2.
F
Update CUSTOMER
Set cust_name=”SMITH”
Where cust_order IN (select cust_ord from ORDER
where order_name = 20);
will require a shared lock on both Customer and Order tables.
T
F
3.
Derived data will always create dependency and the relation will not be in the
third normal form.
T
F
4. Given the following Relation
R ( B, A, C, D) (B) is the PK and following dependency exist (B,A) ----D
Is the relation in 2nd NF?
T
F
5.
Cardinality of following would be
Assuming a club must have at least one student and a student must belong to a club
STUDENT
(0,1)
CLUB
(1,N)
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Ques#2. You have just accepted a job as a CIO (Chief Information Officer) of WHOrWE, a
distribution company. On your first week on the job you discover that database users are entering
one common password to enter to log on to the database each morning when they arrive for
work. You also learned employees leave their workstations connected to the database all day,
even when they are away from their machines for an extended period of time.
(4 points)
Answer each part separately
a. Should you be concerned? WHY?
b. What would you do in this situation?
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Ques#3
Given the following table:
Assign_HRS (Emp_name, Project_ID, Task_ID, Phone, Total-Hours)
An employee can work on many projects and a project can have many tasks
(10 points)
Emp_Name
Project_ID
Task_ID
Phone
Total-hours
Don
Don
Don
Don
Pam
Pam
Pam
100A
100A
200B
200B
100A
200A
200D
B-1
P-1
B-1
P-1
C-1
C-1
C-1
12345
12345
12345
12345
67890
67890
67890
12
12
12
12
26
26
26
Answer the following: (each part is independent)
a. What is the normal form of the ASSIGN_HRS table? Justify your answer
b. assuming total-hours are total hours an employee works, i.e. Don works a total of 12
hours irrespective of the project or task
Based on above assumption, convert the above table in 3NF
c. Assuming that total_hours are the hours worked by an employee on a given PROJECT,
i.e. Don worked 12 hours on PROJECT 100A and 12 hours on Project 200B
Based on assumption in part c, convert the original ASSIGN_HRS table in 3NF
d. Assuming total-hours are the number of hours worked by an employee on a given task
for a given project, i.e. Don worked 12 hours on task B-1 Project 100A, worked 12 hours on
task P-1 on Project 100A etc..
Based on assumption in part d, convert the original ASSIGN_HRS table in 3NF
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Ques#4.
Go to the following Conference web site, an international organization for IS people
http://www.ecis2007.ch/
Answer the following. (stay focused on the web site ONLY, do not go to any hyperlinks.
Identify objects and draw OODM
===================================================
(8 points)
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Ques#5. The following question is based on the DDBMS scenario shown below
(10 points)
TABLES
CUSTOMER
PRODUCT
INVOICE
INV_LINE
FRAGMENTS
N/A
PROD_A
PROD_B
N/A
N/A
LOCATION
C,A
A
B
C
C
Note: both sites A & C have replicated CUSTOMER data; PRODUCT data is partitioned
between two sites A, B.
Specify the minimum type(s) of operation(s) the database must support (remote request, remote
transaction, distributed transaction, or distributed request) in order to perform the following
operations:
At Site C:
a. SELECT CUS_NUM, CUS_NAME, INV_TOTAL
FROM CUSTOMER, INVOICE
WHERE CUSTOMER.CUS_NUM = INVOICE.CUS_NUM;
b. SELECT * FROM
CUSTOMER;
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At Site B:
c. BEGIN WORK;
UPDATE CUSTOMER
SET CUS_BALANCE = CUS_BALANCE + 100
WHERE CUS_NUM='10936';
INSERT INTO INVOICE(INV_NUM, CUS_NUM, INV_DATE, INV_TOTAL)
VALUES ('986391', '10936', ‘15-FEB-2002’, 100);
INSERT INTO INVLINE(INV_NUM, PROD_CODE, LINE_PRICE)
VALUES ('986391', '1023', 100);
COMMIT WORK;
d. SELECT * FROM PRODUCT WHERE PROD_QOH <10;
For above queries identify nature of lock needed (only consider shared & exclusive locks) on
each table: (list N/A if it is not applicable to a table in a given query)
Operation/Query
Minimum type(s)
of operation(s)
database must
support for each
query
Types of lock on
Tables/Query
PRODUCT_A
PRODUCT_B
CUSTOMER
INVOICE
INVLINE
a
b
c
d
a
b
c
d
==============================================================
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Ques#6. (8 points)
Generic answers will NOT get much credit, must relate to concepts from the book or other
resources (list sources).
a. Pho_r_us.com is a completely internet based Chinese noodle company. It started
operations in 2001 and has been very successful until now. In 2005 their sales soared
from $10 million (2001) to $1.2 billion (2005). However sales in first two quarters of
2006 were dismissal and their stock price plummeted 60% in 2006.
Mr. B.T. Smith (Highest degree: MS in MIS, age 32), a UB graduate (2003) was promoted as
DBA at pho_r_us.com on October 2, 2005. Mr. Smith reports directly to Ms Shee (Highest
degree: MBA with MIS concentration; age 52), chief information officer (CIO). On April
15th 2006, marketing department refused to give any additional data access to Ms Shee and
after much discussion, Mr. Lou, the CEO, (highest degree: BA in political Science, age 65)
agreed with the marketing department. On May 6th 2006, Mr. Lou refused Ms Shee’s request
to allocate more money for information technology (IT) needed for B2B and B2C portal
enhancements, even though competition using latest technology, was cutting into
pho_r_us.com’s market share. Competitors are constantly providing incentives using viral
marketing and have added enhancement like; on line secure payment (using paypal), free
delivery (using FedEx/UPS), one click ordering (using Amazon.com technology) and repeat
customer incentives . Pho_r_us.com is losing market share.
Frustrated, Mr. Smith, the DBA, resigned on October 12, 2006. Ms. Shee resigned on
November 2, 2006. What are the repsonsibilities of a CIO & DBA and what are the problems
at pho_r_us.com that made Mr. Smith & Ms. Shee resign?
b. Assume you have a position as a CIO in a large corporation. The company has been collecting
data about employees, including monitoring their working habits by recording their keystrokes,
timing their telephone interactions with clients, and scanning their emails for personal
correspondence. You have asked your DBA to develop a database to store such data. Does the
company have a legal right to perform this kind of monitoring? What is your professional
responsibility in this situation? Visit some ethics sites (www.acm.org or www.ieee.org or any
other professional site to answer this question)
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