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Friday, September 9, 2016

S.B. Roll No.
3rd Exam/Comp/IT/0090/Dec’08
Duration : 3 Hrs.

Note: Any required data not explicitly given , may be suitably assumed and stated.

1.                 Chose the correct or best alternative in the following

a.                 Which of the following is a reason to model data?
i.                   Understand each user’s perspective of data
ii.                 Understand the data itself irrespective of the physical representation
iii.              Understand the use of data across application areas
iv.               All of the above
b.                If an entity can belong to only one lower level entity then the constraint is
i.                  Disjoint
ii.                Partial
iii.             Overlapping
iv.              Single
c.                 The common column is eliminated in
i.                 Theta join
ii.               Outer join
iii.            Natural join
iv.            Composed join
d.             In SQL. Testing whether a sub query is empty is done using
i.                Distinct
ii.             Unique
iii.          Null
iv.                        Exists
e.                  Use of UNIQUE while defining an attribute of a table in SQL means that the attribute value are
i.                        Distinct values
ii.                        Cannot have NULL
iii.                        Both (a) and (b)
iv.                        Same is primary key
f.                   The cost of reading and writing temporary files while evaluating a query can be reduced by
i.                        Building indices
ii.                        Pipelining
iii.                        Join ordering
iv.                        None of the above
g.                 A transaction is in _________ state after the final statement has been executed.
i.                        Partially committed
ii.                        Active
iii.                        Committed
iv.                        None of the above
h.                 In multiple granularity of locks SIX lock is compatible with
i.                        IX
ii.                        IS
iii.                        S
iv.                        SIX
i.                   The statement that is executed automatically  by the system as a side effect of the modification of the database is
i.                        Backup
ii.                        Assertion
iii.                        Recovery
iv.                        Trigger
j.                    The normal form that is not necessarily dependency preserving is
i.                        2NF
ii.                        3NF
iii.                        BCNF
iv.                        4NF

Section –B

Note: Answer all questions. Each question carries 6 marks.


a.                 Briefly describe the different kinds of users of a DBMS.
b.                 Explain the following. Give an example.
i.                        Superkey
ii.                        Weak entity set
iii.                        Attribute inheritance
i.                        Define the concept of aggregation. Give two example where this concept is useful.
ii.                        Define the following
1.                 A relation.
2.                 Atom of domain relational calculus.
d.                 Derive the union rule, decomposition rule and the pseudo transitivity rule using the three Armstrong’s  axioms.
e.                  Define multi valued dependency. What do understand by trivial multivalve dependency?
f.                   Given R(A, B, C, D,E ) and  M the set of multi valued dependencies
i.                        A →→ BC
ii.                        B→→CD
iii.                        E→→AD
Is R in 4NF? Justify your answer. If is not, decompose R into 4NF

Section –C

Note: Attempt any two questions

3.                 Given the relations R(A, B, C) and S (C,D,E,F) given an expression in tuple relational calculus that is equivalent to each of the following.
a.                 II ABC (R)
b.                 σ E=10(S)
c.                  R∞ S
d.                 R
4.                 Given the relations Staff (staff No, position, salary) and property ( number , rent, staff No) given below. The staff looks after a given property.
staff No                position                salary
                             manager               50000.00
                             assistant               15000.00
                             supervisor            25000.00
                             manager               45000.00

          Number                rent                                staffno
          PA14                    5000.00                         SL21
          PG4                      6000.00                         SG5
          PL94                    10000.00                       SL21

Give the result table for the following SQL          queries

i.                   SELECT     position, COUNT(Staff NO) AS POS, my count
FROM                  Staff
ii.                 SELECT     staff no
FROM                  staff
WHERE               salary>(SELECT AVG(salary) FROM staff)
iii.              SELECT     staff no
FROM                  property
GROUP BY         staff no
iv.              INSERT INTO     staff no
VALUES    (‘SG33, assistant’)


a.                 Describe the four main ways of optimizing disk block access.
b.                 Describe the algorithm for updating indices for a single level index when a record is
i.                        Inserted
ii.                        Delected

What will be the modification if there are multilevel indices.


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