Database Management Systems July 2016 Past Paper – KNEC Diploma

Database Management Systems July 2016 Past Examination Question Paper – KNEC

This Past Paper examination was examined by the Kenya National Examination Council (KNEC) and it applies to the following courses:

  • Diploma in Information Communication Technology – Module II

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THE KENYA NATIONAL EXAMINATIONS COUNCIL
DIPLOMA IN INFORMATION COMMUNICATION TECHNOLOGY
MODULE II
DATABASE MANAGEMENT SYSTEMS
JULY 2016
TIME: 3 HOURS

1. (a) Describe two components of a relational database .       (4 marks)
(b) With the aid of an example, distinguish between a  system privilege and an object privilege  as used in databases.                       (4 marks)
c) Explain each of the following terms as used in data recovery in a database.
(i) checkpoint;              (2 marks)
(ii) manual reprocessing;             (2 marks)
(iii) immediate update.        (2 marks)
(d) Peter would like to create a database system. Explain three stages in the database design development that the ER diagram would be most applicable.         (6 marks)

2. (a) (i) Outline two wild card characters used in structured query language.           (2 marks)
(ii) Explain a reason for using if Exists command in a structured query language. (2 mans)
(b)  Distinguish between active data dictionary and passive data Dictionary as used in databases.  (4 marks)
(c) Describe each of the following components ot three-tier database architecture.
(i) application tier;            (2 marks)
(ii) presentation tier;             (2 marks)
(iii) data tier.             (2 marks)
(d)  Figure l show s a filling approach that an educational institution uses to manage its applications. Use it to answer the question that follows. Explain three advantages that the institution will benefit from this approach    (6 marks)

(b) martin would like to enforce sc•curity in a multi{ale user database end ironment using a data

3. a) Outline four factors to consider when developing a user interface for a database system     (4 Marks)
b) Distinguish between a database engine and a database Schema as used in database management system    (4 Marks)
c) Martin would like to enforce a security in a multiple user database environment using a data control commands. Describe two command statements that he is likely to use giving an example in each case.        (4 Marks)
(d)  An organisation intends to acquire a database application to manage its data. Describe three professional that may be required.             (6 marks)

4. (a) Outline four guidelines to consider when using sub queries in a structured query language.      (4 marks)
(b) Distinguish between Embedded and Dynamic structured query language       (4 marks)
(c) Describe two levels of data manipulation language giving an example in each case (6 marks)
d) write the equivalent of each of the following logical operations in relational calculus :

5. a) A teacher noted that a database created by Andrew had data redundancy. Outline three problems that may cause.    (3 marks)
(b) In an orgnisation an employee is identified by a unique number, salary and telephone contact. Each employee works in a department. Each department is managed by an Employee and is identified by a department number, name and i ts budgetary allocation.
Each employee may have a dependent child who is identified uniquely by employee’s unique number, a name and age.
(i) Draw an ER diagram to represent the narrative.   (7 marks)
(ii) Write a structured query language used to create one of the entitles in the ER diagram in (i).               (4 marks)
c) Describe three F. Armstrong’s Axioms set of rules that generates functional dependencies as applied in normalisation of tables.             (6 marks)

6. a) State two similarities between a hierarchical and and network database models.  (4 marks)
(b) Distinguish between relational algebra and relational calculus as used in database (4 marks)
c) Write a relational algebraic statement to perform each of the following :
(i) Delete all loans with loan numbers between 1300 and 1500 from a deposit table.      (2 marks)
(ii) Increase all balances by 5 %t in a deposit table.   (2 marks)
(iii) Display empaname, department where salary is greater than 50,000 from the deposit table   (2 marks)
(d) Explain three categories of anomalies that may be experienced when working with tables that are not normalised in a database.         (6 marks)

7. (a) Outline four structured query language commands that may be used to enhance search capabilities in a database.              (4 marks)
(b)  Explain two reasons for one using online database.    (4 marks)
c) State three differences between a primary key and a foreign key as used in database.           (6 marks)
(d) Outline three characteristics of each of the following distributed
(i) Homogeneous. (3 marks)
(ii) Heterogeneous (3 marks)

8. a) Outline four characteristics of a well designed database.     (4 marks)
(b)          The following are cardinalities that can be used in an ER diagram for the entities A and B. Use it to answer the question that follows.

Describe each of the cardinalities represented in (i) and (ii).
(c)  Write tuple relational caIcu1tLs statements for each of the following:
(i) Find the name of all employees in the employee table who work for the bank named Mini Bank;     (2 marks)
(ii) Find all customers having both a loan and an account at the Kenyatta branch.        (2 marks)
(iii) Display all fields from teaching (T) table where teaching code=”K2000)        (2 marks)
d) Table l shows details about students recorded in un-normalised table. Represent the following information to 2nd normal form. (6 marks)
Student    Age        Subject 
Alice         25           ICT, Programming
Peter        24           Programming
Bob           27           Programming
Table 1

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