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LevelMaster in Data Science (SMS, TU)
SubjectDatabase Management Systems
Year2081 BS
Exam sessionBoard
Full marks45
Time allowed120 minutes
Questions10, all with step-by-step solutions
A

Group A

5 questions·3 marks each
1Short answer3 marks

What are the advantages of using DBMS?

dbmsadvantages
2Short answer3 marks

How is cost-based optimization of SQL queries done?

query-optimizationsql
3Short answer3 marks

How is no waiting algorithm of deadlock prevention different from cautious waiting?

deadlock-preventionconcurrency
4Short answer3 marks

Define a statistical database with an example.

statistical-database
5Short answer3 marks

What is three schema architecture?

schema-architecture
B

Group B

5 questions·6 marks each
6Long answer6 marks

Describe 1NF, 2NF and 3NF with appropriate examples. [6]

OR

Describe the dependency preservation and lossless join property. Describe 4NF with an example. [3+3]

normalizationnormal-forms
7Long answer6 marks

Describe how lost update and dirty read problems occur in concurrent execution of transactions? Illustrate with examples. [6]

OR

How is exclusive lock different from shared lock? Consider any three transactions T1, T2 and T2 are performing read and write operations over data items A, B, and C. Now create a schedule containing T1, T2, and T3 that suffers from deadlock. [2+4]

concurrencytransactionslocking
8Long answer6 marks

How database records are mapped to files using fixed length record and variable length record approaches? Justify with examples. [6]

record-storagefile-organization
9Long answer6 marks

Design an ER diagram that contains at least three entities. One of the entity must be weak entity. There should be many to many relationship between the two strong entities. Use your own assumptions for other requirements. Now convert the so constructed ER diagram into equivalent database table schema. [3+3]

er-diagramschema-design
10Long answer6 marks

Consider the following relations defining the hotel management system. [6]

Food(Fid, Fname, PriceRate, Cookedby, Inspectedby) Cook(Cid, Cname, Cspeciality) FoodInspector(Fid, Fname, Experience) Reportdetail(Fid, Cid, Report_date)

relational-modelhotel-management

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The Master in Data Science (SMS, TU) Database Management Systems 2081 paper carries 45 full marks and is meant to be completed in 120 minutes, across 10 questions.
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