Indexes and Optimization
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Information Technology (IT), Architecture
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KG - University
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Practice Problem
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Hard
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of an index in a database?
To speed up data retrieval
To backup data
To store data
To secure the database
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a key consideration when creating an index?
The type of operating system
The columns chosen for indexing
The number of users accessing the database
The color of the database interface
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the effect of creating an index on a column in SQL?
It increases the speed of data retrieval
It decreases the storage space
It deletes duplicate records
It changes the data type of the column
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does the EXPLAIN statement help in SQL query optimization?
It deletes unnecessary indexes
It automatically optimizes the query
It shows the execution plan of a query
It provides a visual representation of the database
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a composite index?
An index on a single column
An index that combines multiple columns
An index that is automatically created
An index that is used for backup
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to select only necessary columns in a SQL query?
To reduce the amount of data processed
To improve the security of the database
To change the data type of columns
To increase the number of rows returned
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the benefit of using the WHERE clause efficiently?
It increases the number of columns returned
It automatically creates indexes
It changes the data type of the result
It narrows down the data processed
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