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internal-02 - UNIVERSITY OF LONDON Goldsmiths College BSc...

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UNIVERSITY OF LONDON Goldsmiths College BSc Examination 2002 COMPUTING AND INFORMATION SYSTEMS IS52003A (CIS209) Database Systems Internal Duration : 3 hours This paper consists of 5 problems. Each problem carries 25 marks. Answer only 4 of them. You may choose any 4 problems; full marks will be awarded for complete answers to 4 problems. Problems are made of questions. For each problem you choose, attempt all its questions. The mark carried by each question is printed within square brackets. Gauge the length of each answer by the number of marks awarded. Electronic calculators are not necessary for this assignment, therefore they should not be used. THIS EXAMINATION PAPER MUST NOT BE REMOVED FROM THE EXAMINATION ROOM. CIS209 – IS52003A 2002 Internal 1
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PROBLEM 1 [25] Topics covered: generalities about databases ; generalities about the relational model. Question 1 Define the relational model. What is a relational database management system (DBMS)? [3] Question 2 Define the notion of “foreign key”. Give an example. [3] Question 3 Explain the two types of program–data independence on the basis of the three level ANSI/SPARC architecture of a database system. [4] Question 4 What is a system catalogue? Give examples of two types of data/information it usually includes and, in each case, explain the (potential) use of this data/information (one or two sentences per type of data/information). [5] Question 5 Data can be stored in files and application programs can share this data by having a direct access to the respective files (refer to Diagram 1, below). However, data-centred applications normally employ a database management system (refer to Diagram 2, below). State why the latter approach (Diagram 2) is preferred for data-centred applications (refer to at least two features of a DBMS). [5] Question 6 Explain what is it meant by impedance mismatch, in the context of relational database systems. [5] CIS209 – IS52003A 2002 Internal 2 data as files (disk) Program/Application 1 Program/Application n data as files (disk) Program/Application 1 Program/Application n Diagram 1 Diagram 2 TURN OVER Database Management System
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PROBLEM 2 [25] Topics covered: conceptual design / ER modelling ; the transformation of an ER model into a relational model. Question 1 Can a set of data requirements be correctly modelled by two or more different ER diagrams?
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