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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 2 of 9

Q11.
To check how MySQL would execute a SELECT query, which statement is used?
Discuss
Answer: (d).EXPLAIN
Q12.
To perform analysis of key values by the server, the statement used is __________
Discuss
Answer: (b).ANALYZE TABLE
Q13.
Which statement is used to verify optimizer operation?
Discuss
Answer: (c).EXPLAIN
Q14.
Which statement is used to force the optimizer to use tables in a particular order?
Discuss
Answer: (d).STRAIGHT_JOIN
Q15.
Which of these comparisons is slowest?
Discuss
Answer: (b).INT/BIGINT
Q16.
Which of the following WHERE clauses are faster?
    1. WHERE col * 3 < 9
    2. WHERE col < 9 / 3
Discuss
Answer: (b).2
Q17.
What are the results of the following SQL commands if col is an integer column?
 1. SELECT * FROM mytbl WHERE num_col = '4';
 2. SELECT * FROM mytbl WHERE num_col = 4;
Discuss
Answer: (a).same
Q18.
Which system variable tells the optimizer to skip certain plans based on estimates of the number of rows accessed for each table?
Discuss
Answer: (a).optimizer_prune_level
Q19.
Which system variable tells how far into the rest of each incomplete plan the optimizer should look to evaluate whether it should be expanded further?
Discuss
Answer: (b).optimizer_search_depth
Q20.
The optimizer_prune_level is set by default.
Discuss
Answer: (a).True
Page 2 of 9

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