JNTU
JNTU B.Tech II DATABASE MANAGEMENT SYSTEMS Previous Question Paper (April/May - 2023 - R15)
Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Distinguish between super key and Candidate key.
Answer
A super key is a set of one or more attributes that uniquely identifies a tuple in a relation. A candidate key is a minimal super key, meaning no proper subset of its attributes can uniquely identify a tuple.
How do you represent the following in E-R model?
i) Weak entity set ii) Role iii) Strong entity set
Answer
i) Weak entity set: Represented by a double-bordered rectangle; its identifying relationship is a double-bordered diamond. ii) Role: Represented by labeling the edges connecting an entity set to a relationship set. iii) Strong entity set: Represented by a single-bordered rectangle.
What are various Domain constraints SQL?
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Explain tuple relational calculus.
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Define functional dependencies with example.
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What are the conditions for 2NF with example?
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Explain about durability of transaction.
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Explain about the multiple granularity.
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What is the order of B+ tree?
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What is difference between Indexing and hashing?
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Part B
What are the goals and advantages of DBMS?
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Develop an E-R Diagram for any Banking enterprise system.
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What are the functions of Database Administrator?
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What is data model? Explain Relational Model and E-R model.
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What are NULL values? Are they supported in relational model? How do they effect the meaning of queries? Can primary key fields of table contain null values?
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What is the difference between tuple relation calculus and domain relation calculus?
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What aggregate operators does SQL support? Explain.
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Explain how to implement triggers in SQL.
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Explain about the Functional dependency and Multivalued dependency.
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What are the conditions required for a relation to be in 3NF and 4NF? Explain.
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Explain about the lossless join and dependency preserving with examples.
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Compute the closer of the following set of functional dependencies for a relation scheme. R(A,B,C,D,E,F,G,H), F={AB→C, A→DE, B→F,F→GH}. List out the candidate keys of R.
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Explain Multiple granularity locking approach and how does it works.
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What is log file? Explain the following log based recovery schemes: i) Deferred data base modification ii) immediate data base modification.
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Show that the two phase locking protocol ensure the conflict serializability and that transactions can be serialized according to their locks.
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Explain about remote backup systems.
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How does ISAM handles insert and delete operations? Explain.
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Discuss the relationship between Extendible and Linear Hashing. What are their relative merits and demerits?
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What is indexing? Explain the cluster index, primary and secondary indexes with examples.
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Differentiate between tree based and Hash based indexes.
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