Test Papers / Previous Question Papers of IGNOU CS06 Database Management System December 2006

Time: 3 hours
Maximum Marks: 75

Note: (1) Question no. 1 is compulsory. Attempt any three questions from the rest

1. (a) A university registrar's office maintains data about the following entities : (10)

(i) Course, including number, title, credits, syllabus and prerequisites
(ii) Course offering, including course number, year, semester, section number, instructor(s), timings and classroom.
(iii) Students, including student-id, name and program.
(iv) Instructors, including identification number, name, department and title.

Further, the enrolment of students in courses and grades awarded to students in each course they are enrolled for must be appropriately modelled.

Construct an E - R diagram for the Registrar's office. Document all assumptions that you make about the mapping constraints.

(b) Discuss the three level architecture of DBMS. Explain how does it lead to data independence. (7)

(c) With the help of an example, explain the inverted file organization. (4)

(d) What is a view ? Explain with the help of an example. Also specify the five conditions that a view must meet in order to allow the updates. (5)

(e) With the help of an example, explain how knowledge representation can be done through Semantic Network. (4)

2. (a) Consider the following 3 tables

PAINTER

GALLERY

PAINTING

Write the relational algebraic expressions/queries for the following operations:

(i) Find all painters who have painted in GAL_NUM=4.
(ii) Find all paintings of Gallery whose rate is > 1000
(iii) Find the Gallery in which painter 'Ramesh' has displayed his paintings.
(iv) Find the number of paintings displayed in Gallery owned by 'Shyam'. (8)

(b) Explain the concepts of Generalization and Specialization with examples. (7)

3. (a) Mention the features of OODBMS and give four advantages of it. (6)

(b) What are the general resistances faced by an organization while implementing DBMS tool ? Explain at least four of them (4)

(c) What is client/server computing ? Discuss the components of client/server computing. (5)

4. (a) Given the structure

(i) Identify the anomalies in the given structure. (3)
(ii) Normalise it upto third normal form (3NF). (6)

(b) Explain any three aggregate functions of SQL with an example for each. (6)

5. (a) Explain the structure of Index sequential file with the help of a diagram. (5)

(b) Explain briefly: (5)

(i) Dynamic Data Exchange (DDE)
(ii) Object Linking & Embedding (OLE)

(c) Illustrate the differences between hierarchical and network data models. Explain why relational data model is a better choice over the two. (5)