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Welcome to the Data Storage and Querying MCQs Page

Dive deep into the fascinating world of Data Storage and Querying with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Data Storage and Querying, a crucial aspect of DBMS. In this section, you will encounter a diverse range of MCQs that cover various aspects of Data Storage and Querying, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within DBMS.

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Check out the MCQs below to embark on an enriching journey through Data Storage and Querying. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of DBMS.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Data Storage and Querying. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Data Storage and Querying MCQs | Page 12 of 21

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Q111.
What is the function of the equi-width histogram?

a.

Adjusts boundaries of the ranges such that each range has the same number of values

b.

Divides range of values into equal sized ranges

c.

Divides the range of values into ideally sized ranges

d.

Does not divide the range of values.

Discuss
Answer: (b).Divides range of values into equal sized ranges
Q112.
What kind of a sample must be used for statistical analysis?

a.

A random sample

b.

A sample having excessive representation of a relation

c.

A sample having suppressive representation of a relation

d.

None of the mentioned

Discuss
Answer: (a).A random sample
Q113.
The ________ SQL command generates statistics on a particular relation

a.

Statistic

b.

Analyze

c.

Modify

d.

Runstats

Discuss
Answer: (b).Analyze
Q114.
The union of all records satisfying the individual simple conditions Oi is called as ________

a.

Conjunctive selection

b.

Disjunctive selection

c.

Negation

d.

None of the mentioned

Discuss
Answer: (b).Disjunctive selection
Q115.
The intersection of all records satisfying the individual simple conditions Oi is called as ________

a.

Conjunctive selection

b.

Disjunctive selection

c.

Negation

d.

None of the mentioned

Discuss
Answer: (a).Conjunctive selection
Q116.
State true or false: Estimation of the size of the result of a join is not possible

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (b).False
Q117.
Size estimation can be done for which of the following processes?

a.

Projection

b.

Aggregation

c.

Set operation

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q118.
The size of a _____ is simply V(A,r) where r is the relation and A is a distinct value

a.

Projection

b.

Outer join

c.

Aggregation

d.

Inner join

Discuss
Answer: (c).Aggregation
Q119.
A ________ explores the space of all query evaluation plans that are equivalent to a given query.

a.

Cost based optimizer

b.

Space based optimizer

c.

Time based optimizer

d.

None of the mentioned

Discuss
Answer: (a).Cost based optimizer
Q120.
What is the disadvantage of cost based optimizers?

a.

It is too expensive

b.

It is inefficient in producing results

c.

It does not perform the desired function

d.

None of the mentioned

Discuss
Answer: (a).It is too expensive
Page 12 of 21

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