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Welcome to the Query Optimization MCQs Page

Dive deep into the fascinating world of Query Optimization with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Query Optimization, a crucial aspect of MySQL Database. In this section, you will encounter a diverse range of MCQs that cover various aspects of Query Optimization, 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 MySQL Database.

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Check out the MCQs below to embark on an enriching journey through Query Optimization. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of MySQL Database.

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

Query Optimization MCQs | Page 1 of 9

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Q1.
Using indexes optimizes query performance.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q2.
The maximum number of indexes on MyISAM table is __________

a.

0

b.

1

c.

2

d.

more than 1

Discuss
Answer: (d).more than 1
Q3.
The data rows of a MyISAM table are stored in __________

a.

data file

b.

index file

c.

log file

d.

error file

Discuss
Answer: (a).data file
Q4.
In a single table (with 10 columns) join query the number of values needed to examine per column is __________

a.

1

b.

10

c.

0

d.

2

Discuss
Answer: (b).10
Q5.
Suppose tbl_1 is a table consisting of 8 rows and tbl_2 is a table consisting of 6 rows, the number of combinations through which the search is performed is __________ 
SELECT tbl_1.i1, tbl_2.i2
 FROM tbl_1 INNER JOIN tbl_2
 WHERE tbl_1.i1 = tbl_2.i2;

a.

14

b.

2

c.

1

d.

48

Discuss
Answer: (d).48
Q6.
How many of the following shared tablespaces is bound by the OS file size limit?

MyISAM, InnoDB, TRANSACTION

a.

0

b.

1

c.

2

d.

3

Discuss
Answer: (b).1
Q7.
If a column contains 7 values and 6 distinct values, the cardinality is __________

a.

7

b.

6

c.

13

d.

1

Discuss
Answer: (b).6
Q8.
For a table having 4 columns, the number of columns to which hash function is applied when using hash indexes is __________

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (d).4
Q9.
The slow query log can be used to identify queries that may be performing badly.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q10.
The slow query log is written as __________

a.

numbers

b.

text

c.

image

d.

graph

Discuss
Answer: (b).text
Page 1 of 9

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