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Database Management Systems November 2015 Question Paper

Database Management Systems November 2015

Course:Diploma In Information Communication Technology Module Ii

Exam Year:2015

DIPLOMA IN INFORMATION COMMUNICATION TECHNOLOGY MODULE II
DATABASE MANAGEMENT SYSTEMS
November 2015

Answer FIVE of the following EIGHT questions.

1. (a) (i) List six examples database management systems available in the market (3 marks)
(ii) Describe a relational database management system (2 marks)
(b) Describe each of the following components of a database
(i) stored procedures (2 marks)
(ii) tables (2 marks)
(iii) triggers (2 marks)
( c) With the aid of a diagram , describe the three schema database architectures ( 9 marks )
2. (a) Outline three characteristics of an entity in a database (3 marks)
(b) Describe each of the following criteria for classification of database management systems
(i) based on data models (2 marks )
(ii) based on the number of users ( 2 marks )
(iii) based on database distribution (2 marks )
( c) With the aid of an example, distinguish between integrity and domain constraints as used in
databases (5 marks )
(d) With the aid of an example in each case, describe each of the following attributes as used in
databases
(i) simple (2 marks )
(ii) composite (2 marks)
(iv) derived (2 marks )
3. (a) outline four advantages of using indexes in structured query language (4 marks )
(b) write a structured query language statements equivalent for each of the following relational
algebra operations
(i) project (2 marks )
(ii) difference (2 marks )
(iii) union (2 marks )
( c) Distinguish between a data administrator and database administrator as used in
databases(4 marks)
(d) Alex is in the process of designing a database . Explain three phases that he should consider
during design (6 marks)
4. (a) with the aid of an example describe a hypermedia database (3 marks)
(b) Explain why each of the following is a threat to databases
(i) loss of integrity (2 marks)
(ii) loss of availability (2 marks )
(iii) loss of confidentiality (2 marks )
( c) in a college , a lecturer may teach many subjects but may not belong to more than one
department. The college maintains information of its lecturer subjects area as follows
Lecturer number ,lecturer name ,lecturer grade, department code , department
name ,subjects codes, subjects name , and subjects level.
Represent this information to 3rd normal form ( 11 marks)

5. (a) (i) Describe the term repeating group as used in normalization (2 marks)
(ii) Outline three goals that would be achieved from using a normalized table
(3 marks)
(b) Describe each of the following terms as used in database management
(i) domain relational calculus (2 marks)
(ii) query optimizer (2 marks )
(iii) relational algebra (2 marks )
(c ) Represent each of the following structured query language statements using a Venn diagram
(i) SELECT *
From table _{_}A A
FULL OUTER JOIN TABLE _–B B
ON A.KEY =B.KEY
WHERE A.KEY IS NULL OR B .KEY IS NULL (3 marks)
(ii) SELECT *
FROM TABLE –A A
RIGHT JOIN TABLE –B B
ON A.KEY =B.KEY
WHERE A.KEY IS NULL (3 marks)
(iii) SELECT *
FROM TABLE _–A A
FULL OUTER JOIN TABLE _–B B
ON A. KEY =B. KEY (3 marks)
6. (a) Describe each of the following approaches used in the design of a database
(i) top down (2 marks)
(ii) bottom up (2 marks)
(b) Write a structured query language statements that would
(i) display first 3 characters of field first –name from a table named employee (2 marks)
(ii) display names that begin with letters in range of D through G from the first –name field from the employee table (3 marks)
(iii) create a table named employeedata with the following properties(5 marks)

(iv) Change the email and commission field values of employees table with ''not available'' and 0.10 respectively for those employees whose department_{_}id is 150; (3 marks )
(v) Add a field named region_–id after start_–date to the table employeedata table (3 marks)
7. (a) Outline four types of states that a transaction may be in during processing in a database
management system.(4 marks)
(b) Distinguish between direct and indirect end users as used in DBMS.(4 marks)

(c ) Aristocrafty, encountered some challenges when they introduced a distributed database
management system. Explain three technical challenges that the company may have faced.(6 marks)
(d)Write equivalent relation algebra statements for each of the following structured query
language statements;
(i) SELECT ActionTitle
FROM STARS stars, Actionmovie
WHERE starName = Andrew and birthdate=1956
(ii) select a,b
From table1, table2
Where d>e and f=g;
(iii) (select sum (salary
From employee
WHERE DEPARTMENT = ''COMPUTER''
8. (a) Outline four functions of views as used in structured query language (4 marks)
(b) Under what circumstance would each of the following joins be used in relational
(i) left join(2 marks
(ii) equi join (2 marks)
(iii) cross join (2 marks)
(c ) Distinguish between data manipulation language and transaction control as language as used in structured query language(4 marks)
(d) Mwaziri intends to design an Entity relationship diagram for a proposed database system outline
six procedures guidelines that with enable him meet his objectives.(6 marks)

Database Management Systems November 2015 Question Paper

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