EXAMINATION FOR THE BSC (HONS) IN INFORMATION SYSTEMS; YEAR 2

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1 FACULTY OF SCIENCE AND TECHNOLOGY EXAMINATION FOR THE BSC (HONS) IN INFORMATION SYSTEMS; YEAR 2 ACADEMIC SESSION; 2013 SEMESTER 4 SEG2102: DATABASE MANAGEMENT SYSTEMS FINAL JULY 2013 EXAM CYCLE TIME: 2 HOURS + 10 MINUTES READING TIME INSTRUCTIONS TO CANDIDATES This question booklet contains two sections. Section A: Answer the compulsory question. Section B: Answer two questions out of three questions All answers must be written in the answer booklets provided using blue or black INK. IMPORTANT NOTES TO CANDIDATES Materials Allowed Standard Items : Pen, Pencil, Eraser or Correction Fluid, Ruler Special Items : Non Programmable Calculators It is your responsibility to ensure that you do NOT have in your possession any unauthorised notes or any other means that would improperly help you in your work. If you have any unauthorised materials with you, hand it to the invigilator BEFORE reading any further. DO NOT REMOVE THIS QUESTION PAPER FROM THE EXAMINATION HALL [This paper contains FOUR questions printed on FIVE pages]

2 Section A Answer Question 1 from this section. Question 1 is a compulsory question. Question 1 (50 marks) Answer all questions (a), (b) and (c) in the following. (a) Read the following case study, which describes the data requirements for a book rental company. The book rental company has several branches. The data held on each branch is the branch address made up of street, city, state, and zip code, and the telephone number. Each branch is given a branch number, which is unique throughout the company. Each branch is allocated with staff, which includes a Manager. The Manager is responsible for the day-to-day running of a given branch. The data held on a member of staff is his or her name, position, and salary. Each member of staff is given a staff number, which is unique throughout the company. Each branch has a stock of books. The data held on a book is the catalog number, book number, title, category, daily rental, cost, status, and the names of the main authors. The catalog number uniquely identifies each book. However, in most cases, there are several copies of each book at a branch, and the individual copies are identified using the book number. A book is given a category such as Fiction, Children, Travel, Cooking or Health. The status indicates whether a specific copy of a book is available for rent. Before renting a book from the company, a customer must first register as a member of a local branch. A customer can register in different branches. The data held on a member is the first and last name, address, and the date that the member registered at a branch. Each member is given a member number, which is unique throughout all branches of the company. Once registered, a member is free to rent books, up to maximum of ten at any one time. The data held on each book rented is the rental number, the full name and number of the member, the book number, title, and daily rental, and the dates the book is rented out and date returned. The rental number is unique throughout the company. i) Identify the main entity types of the book rental company. ii) Identify the main relationship types between the entity types described in i) and represent each relationship as an ER diagram. iii) Determine the multiplicity constraints for each relationship described in ii). Represent the multiplicity for each relationship in the ER diagrams. (July 2013) 1

3 (b) iv) Identify attributes and associate them with entity or relationship types. Represent each attribute in the ER diagrams created in iii). v) Determine candidate and primary key attributes for each (strong) entity type. vi) Using your answers i) to v) attempt to represent the data requirements of the book rental company as a single ER diagram. (3 marks) State any assumption necessary to support your design. A property agency called FineHome manages property on behalf of the owners, and as part of this service, the agency carries out regular inspection of the property by the agency s company staff. When staff are required to undertake these inspections, they are allocated a company car for the day. A member of staff may inspect several properties on a given date, and a property is only inspected once on a given date. An example of a FineHome Property Inspection Report is shown in table below, and displays information on the inspections of property numbers PG4 and PG16. Table Name: PROPERTY_INSPECTION PNo PAddress IDate ITime Comments SNo SName CarReg PG4 6 Red Street, London 18-Oct :00 Need to replace crockery. S37 Ann Lee WB Apr :00 In good order. S14 Dave Kim TN978 1-Oct :00 Damp rot in bathroom. S14 Dave Kim MT301 PG16 5 New Street, London 22-Apr :00 Replace living room S14 Dave Kim TN978 carpet. 24-Oct :00 Good condition. S37 Ann Lee MT301 i) Explain the problems (susceptible to update anomalies) of insertion, deletion and update of the PROPERTY_INSPECTION table. ii) Draw the dependency diagram based on the PROPERTY_INSPECTION table. Break up the dependency diagram to create new dependency diagrams. Describe the process of normalizing the table shown above to higher normal form. State any assumption you made about the data shown in the table. (10 Marks) (c) Describe the following features of Extended ER modelling with example. i) Specialization ii) Constraints(Disjoint or Overlapping) iii) Attribute inheritance (July 2013) 2

4 Section B Answer any 2 questions from this section. Question 2 (25 marks) Table CUSTOMER below shows the simplified customer personal and payment information of a company that operates in three regions R1, R2 and R3. Table name: CUSTOMER CUST_NO CUST_NAME CUST_ADDRESS CUST_REGION CUST_BAL CUST_DUE 100 Mega, Inc. 13 Main St. R Yee Inc. 18 Rainy St. R NGT Corp. 22 Hert St. R More Inc. 9 Jacob Rd. R JCT Corp. 8 Lane Rd. R MBI Inc. 33 Ray St. R Use the CUSTOMER table to answer Questions a-c. Each question in a, b and c describes different requirement on data fragmentation strategy. Based on each different requirement a, b and c stated below, identify the appropriate data fragmentation design strategy and use the attributes data in table CUSTOMER, give an example to explain the data fragmentation design structure. (a) Suppose the company management requires information about its customers in all three regions, but company locations in each region (R1, R2, and R3) require data local customers only. (7 marks) (b) Suppose the company is divided into two departments: the service department and payment collections department. Each department is located in a separate building, and each has an interest in only a few of the CUSTOMER table s attributes, i.e. service department is interested in attributes of CUST_NO, CUST_NAME, CUST_ADDRESS and CUST_REGION, payment collections department is interested in attributes CUST_NO, CUST_BAL and CUST_DUE. (c) Suppose the company s structure requires that the CUSTOMER data be fragmented horizontally to accommodate the different company locations; within the locations, the data must be fragmented vertically to accommodate the different departments (i.e. service and payment collections). (12 marks) (July 2013) 3

5 Question 3 (25 marks) (a) Given a manufacturer of product XYZ that is composed of three parts X, Y and Z. Each part is supplied by different vendor. Each time a new product XYZ is created, it must be added to the product inventory, using the PROD_QOH in a table named PRODUCT. And each time the product is created, the part inventory, using PART_QOH in a table named PART, must be reduced by one each parts of X, Y, and Z. The sample database contents are shown in the following tables. Table Name: PRODUCT Table Name: PART PROD_CODE PROD_QOH PART_CODE PART_QOH XYZ 1138 X 763 Y 68 Z 377 Given the information above, answers Question i)-iv). i) How many database requests (i.e. SQL command required) can you identified for an inventory update for both PRODUCT and PART? (1 marks) ii) Write the complete transaction(s) using SQL based on each database request you identified in question (i). iii) Write the transaction log, consists of the information of transaction log ID, transaction number, previous and next pointer, operation, table required for the transaction, row ID, affected attribute(s), before and after value of the attribute(s). [Note: Choose your own numbers to transaction log ID and transaction number as the automatic numbers generated by the DBMS.] (10 marks) iv) Briefly explain the potential problems caused by concurrency in a multiuser database system. Briefly describe concurrency control and the most common techniques for concurrency control. (b) Briefly explain the following in terms of providing security for a database: i) Authorization. ii) Integrity. iii) Views. iv) Backup and recovery. (July 2013) 4

6 Question 4 (25 marks) (a) What is a data warehouse? Explain four (4) characteristics of a data warehouse. What does it mean that a data warehouse is non-volatile? (10 marks) (b) Discuss the relationship between data warehousing and data mining. (9 marks) (c) Describe the processes associated with data extraction, cleansing, and transformation tools. ~ END OF PAPER ~ (July 2013) 5

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