MariaDB Quiz - MCQ Questions and Answers

MariaDB is an open-source relational database management system (RDBMS) that is a fork of MySQL. It is widely used for applications requiring reliability, performance, and scalability in managing structured data. This quiz will help you test your understanding of MariaDB concepts, features, and common use cases.

Let’s begin with these multiple-choice questions (MCQs) to test your knowledge of MariaDB.

1. What is MariaDB?

a) A NoSQL database

b) A relational database management system (RDBMS)

c) A file storage system

d) A distributed caching system

Answer:

b) A relational database management system (RDBMS)

Explanation:

MariaDB is a relational database management system (RDBMS) that provides a structured way to store, retrieve, and manage data using SQL queries.

2. MariaDB is a fork of which database?

a) PostgreSQL

b) Oracle

c) MySQL

d) SQL Server

Answer:

c) MySQL

Explanation:

MariaDB was created as a fork of MySQL, offering a similar feature set with improved performance, open-source development, and community-driven enhancements.

3. Which query language does MariaDB use?

a) NoSQL

b) SQL

c) SPARQL

d) GraphQL

Answer:

b) SQL

Explanation:

MariaDB uses Structured Query Language (SQL) for interacting with relational data, just like MySQL.

4. What is the default storage engine in MariaDB?

a) MyISAM

b) InnoDB

c) Aria

d) RocksDB

Answer:

b) InnoDB

Explanation:

InnoDB is the default storage engine in MariaDB, known for its ACID-compliant transactions and support for foreign keys.

5. What is the function of the WHERE clause in MariaDB SQL queries?

a) To limit the number of rows returned

b) To filter records based on a specific condition

c) To sort the result set

d) To join two tables

Answer:

b) To filter records based on a specific condition

Explanation:

The WHERE clause is used to filter records in a SQL query, returning only those rows that meet the specified condition.

6. Which command is used to create a new database in MariaDB?

a) CREATE DATABASE

b) NEW DATABASE

c) CREATE SCHEMA

d) INIT DATABASE

Answer:

a) CREATE DATABASE

Explanation:

The CREATE DATABASE command is used to create a new database in MariaDB.

7. Which of the following is true about MariaDB replication?

a) It only supports master-master replication

b) It supports master-slave replication

c) It does not support replication

d) It only replicates schema, not data

Answer:

b) It supports master-slave replication

Explanation:

MariaDB supports both master-slave and master-master replication, making it suitable for distributed databases and high availability.

8. What is a primary key in MariaDB?

a) A key that identifies a unique record in a table

b) A key that is always indexed

c) A key that encrypts the database

d) A key used to sort the records

Answer:

a) A key that identifies a unique record in a table

Explanation:

A primary key uniquely identifies each record in a table, ensuring that no two rows have the same primary key value.

9. How can you back up a MariaDB database?

a) Using the SQL command BACKUP DATABASE

b) Using the mysqldump command-line tool

c) By exporting the data as a text file

d) By using a GUI tool like MySQL Workbench

Answer:

b) Using the mysqldump command-line tool

Explanation:

The mysqldump tool is commonly used to back up MariaDB databases by exporting the database schema and data to a text file.

10. What command is used to delete a table in MariaDB?

a) REMOVE TABLE

b) DROP TABLE

c) DELETE TABLE

d) DESTROY TABLE

Answer:

b) DROP TABLE

Explanation:

The DROP TABLE command is used to permanently delete a table and its data from the database in MariaDB.

11. Which of the following storage engines is not supported by MariaDB?

a) InnoDB

b) Aria

c) XtraDB

d) Cassandra

Answer:

d) Cassandra

Explanation:

MariaDB supports multiple storage engines like InnoDB, Aria, and XtraDB, but Cassandra is not a supported storage engine.

12. Which command is used to update existing data in a MariaDB table?

a) MODIFY

b) ALTER

c) UPDATE

d) SET

Answer:

c) UPDATE

Explanation:

The UPDATE command is used to modify the data in existing rows in a MariaDB table.

13. What is a foreign key in MariaDB?

a) A key that encrypts data

b) A key used for caching

c) A key that links data between two tables

d) A key used for indexing

Answer:

c) A key that links data between two tables

Explanation:

A foreign key is used to establish a relationship between two tables by linking the primary key of one table to a field in another table.

14. How can you list all databases in MariaDB?

a) SHOW TABLES

b) LIST DATABASES

c) SHOW DATABASES

d) DATABASE LIST

Answer:

c) SHOW DATABASES

Explanation:

The SHOW DATABASES command is used to list all databases in MariaDB.

15. What does ACID stand for in the context of MariaDB transactions?

a) Asynchronous, Consistent, Independent, Durable

b) Automatic, Correct, Invariant, Deterministic

c) Atomicity, Consistency, Isolation, Durability

d) Application, Consistency, Index, Dependency

Answer:

c) Atomicity, Consistency, Isolation, Durability

Explanation:

ACID refers to the set of properties that guarantee that database transactions are processed reliably: Atomicity, Consistency, Isolation, and Durability.

16. Which function is used to count the number of rows in a MariaDB table?

a) COUNT()

b) SUM()

c) LENGTH()

d) AVG()

Answer:

a) COUNT()

Explanation:

The COUNT() function is used to return the number of rows that match a specified condition in a MariaDB table.

17. What is a JOIN operation in MariaDB used for?

a) To combine rows from two or more tables based on a related column

b) To backup a table

c) To encrypt data across multiple tables

d) To aggregate data into a new table

Answer:

a) To combine rows from two or more tables based on a related column

Explanation:

A JOIN operation is used to retrieve data from two or more tables by combining them based on a related column, typically a foreign key.

18. What does the DISTINCT keyword do in a MariaDB SELECT query?

a) It removes duplicate rows from the result set

b) It sorts the result set

c) It calculates averages for each column

d) It limits the number of rows returned

Answer:

a) It removes duplicate rows from the result set

Explanation:

The DISTINCT keyword is used in a SELECT query to ensure that duplicate rows are removed from the result set.

19. How can you change a column's data type in an existing MariaDB table?

a) MODIFY TABLE

b) UPDATE COLUMN

c) ALTER TABLE

d) CHANGE TYPE

Answer:

c) ALTER TABLE

Explanation:

The ALTER TABLE command is used to modify the structure of an existing table, including changing the data type of a column.

20. Which function is used to concatenate two strings in MariaDB?

a) ADD()

b) CONCAT()

c) MERGE()

d) JOIN()

Answer:

b) CONCAT()

Explanation:

The CONCAT() function is used to concatenate two or more strings in MariaDB, combining them into one string.

These questions cover the basic features and functionalities of MariaDB, including queries, data manipulation, and database management. Understanding these fundamentals will help you work effectively with MariaDB in your projects.