BIT1207A   DATABASE SYSTEMS PRINCIPLES.

UNIVERSITY EXAMINATIONS
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN
INFORMATION TECHNOLOGY
BIT1207A DATABASE SYSTEMS PRINCIPLES
DATE: APRIL 2018 TIME: 2 Hours
Instructions
o Answer question ONE and any other TWO.
o Question One carry 30 marks, others 20 marks each.

QUESTION ONE.(COMPULSORY)
(a) Describe Primary and Foreign Keys in RELATIONAL databases (4 Marks)
(b) Discuss the five dis-advantages of DBMS (5 Marks)
(c) With respect to information management, compare the following concepts;
(i) Instance and schema (4 Marks)
(ii) Tuple and attribute (4 Marks)
(iii) File system and DBMS (4 Marks)
(d) There are three default database schemas that found in SQL namely information-schema, MySQL
and Test. Discuss each showing its role in DBMS. (6 Marks)
(e) Discuss three important database security features. (3 Marks)
QUESTION TWO
a) i) Define the term ‘SQL’ with reference to database systems (3 Marks)
ii) Distinguish between data definition and data manipulation (2 Marks)
b) Draw a table called STUDENT, with six fields AND Five records. (3 Marks)
c) Use the above table in b) above to demonstrate AND explain the following command:
i. CREATE TABLE (3 Marks)
ii. INSERT (3 Marks)
iii. SELECT (3 Marks)
iv. UPDATE (3 Marks)
QUESTION THREE
(a) Below is a list of potential entities for a School database;
Employee
– Pupil
– Class
Draw an ERD diagram showing all possible attributes together with PK and FK.
(10 Marks)
(b) (i) What is data integrity (2 Marks)
(ii) What are constraints? Discuss three benefits of constraints (4 Marks)
(c) What is a Relational Database? Give two examples. (4 marks)
QUESTION FOUR
(a) Discuss normalization. Show why it is important in database design and demonstrate how it is
done. Include UNF, 1NF, 2NF and 3NF (10 Marks)
(b) Discuss, with the help of a diagrams, the database life cycle. (10 Marks)
QUESTION FIVE
(a) Discuss three levels of database design. (6 Marks)
(b) Write short notes on the following topics: (8 Marks)
(i) Data warehouse
(ii) Data mining
(iii) Client/Server database
(iv) Web database
(c) Discuss three dependencies’ used during normalization (6 Marks)

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