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DBMS Interview Questions and Answers

In this article we have gathered the latest and most asked DBMS Interview Questions and Answers for both freshers and experienced. The DBMS Interview Questions cover the topics related to questions about database normalization, primary and foreign keys, SQL, and indexing etc. By reviewing these topics and practicing your answers, you can increase your chances of success and land your dream job in database management.

A DBMS (database management system) is a software application that is used to create, maintain, and manage a database. It allows users to create, read, update, and delete data from the database, as well as perform various other tasks related to database management. If you’re planning to pursue a career in database management, it’s important to be well-prepared for DBMS-related interview questions. In this post, we’ll go over some of the most common DBMS interview questions and provide helpful answers to guide you through your interview.

DBMS Interview Questions and Answer

These DBMS Interview Questions will help job seekers to prepare well for the job interview and cross the panel discussion easily.

So let’s get started :

1. What is a DBMS?
2. What are the different types of DBMS?
3. What is normalization?
4. What is a primary key?
5. What is a foreign key?
6. What is SQL?
7. What is an index?
8. What is a database schema?
9. What is a database transaction?
10. What is a database index?
11. What is database normalization?
12. What is a database view?
13. What is database replication?
14. What is a database cursor?
15. What is a database trigger?
16. What is a database stored procedure?
17. What is a database view?
18. What is database security?
19. What is a database transaction?
20. What is a database constraint?
21. What is a database normal form?
22. What is a database schema?
23. What is database normalization?
24. What is database concurrency control?
25. What is a database lock?
26. What is a database deadlock?
27. What is a database transaction isolation level?
28. What is a database two-phase commit?
29. What is a database materialized view?
30. What is a database stored procedure?

1. What is a DBMS?

A DBMS is a software application that is used to create, maintain, and manage a database. It allows users to create, read, update, and delete data from the database, as well as perform various other tasks related to database management.


2. What are the different types of DBMS?

There are several types of DBMS, including:

  • Relational DBMS (RDBMS): A RDBMS is a type of DBMS that uses a structured approach to storing data in the form of tables. Each table consists of rows and columns, with each column representing a different attribute of the data and each row representing a unique record.
  • Object-oriented DBMS (OODBMS): An OODBMS is a type of DBMS that stores data in the form of objects. It is designed to work with object-oriented programming languages, such as C++ and Java.
  • Hierarchical DBMS: A hierarchical DBMS stores data in the form of a tree structure, with each parent node having one or more child nodes.
  • Network DBMS: A network DBMS stores data in the form of a network, with each record having multiple relationships with other records.

3. What is normalization?

Normalization is the process of organizing a database in a way that reduces redundancy and dependency. It involves dividing a large table into smaller tables and establishing relationships between them. This helps to eliminate data redundancy and improve the overall efficiency and integrity of the database.

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4. What is a primary key?

A primary key is a field in a table that is used to uniquely identify each record in the table. It cannot be null and must be unique across all records in the table.


5. What is a foreign key?

A foreign key is a field in a table that refers to the primary key of another table. It is used to establish a relationship between the two tables and helps to ensure data integrity.


6. What is SQL?

SQL (Structured Query Language) is a programming language used to create, modify, and query databases. It is a standard language for interacting with relational databases and is used by many DBMSs.


7. What is an index?

An index is a data structure that is used to improve the performance of queries by providing quick access to specific records in a table. It is essentially a map of the data in a table, with each index entry pointing to the location of a specific record in the table.


8. What is a database schema?

A database schema is the structure of a database, which defines the types of data that can be stored in the database and the relationships between those data. It includes the database’s tables, fields, and the relationships between them.


9. What is a database transaction?

A database transaction is a unit of work that is performed against a database. It consists of one or more database operations, such as insert, update, or delete, that are executed as a single unit. Transactions ensure that the database remains in a consistent state, even if there are errors or failures during the transaction.


10. What is a database index?

A database index is a data structure that is used to improve the performance of queries by providing quick access to specific records in a table. It is essentially a map of the data in a table, with each index entry pointing to the location of a specific record in the table.


11. What is database normalization?

Database normalization is the process of organizing a database in a way that reduces redundancy and dependency. It involves dividing a large table into smaller tables and establishing relationships between them. This helps to eliminate data redundancy and improve the overall efficiency and integrity of the database.


12. What is a database view?

A database view is a virtual table that is created based on a SELECT statement. It does not store data itself, but rather displays data from one or more tables in a specific way. Views can be used to simplify complex queries and provide a specific view of the data to users.


13. What is database replication?

Database replication is the process of copying data from one database to another database. This can be done for a variety of purposes, such as creating backups, improving performance, or enabling data to be accessed from multiple locations. There are several different types of database replication, including master-slave replication, peer-to-peer replication, and snapshot replication.

In master-slave replication, one database (the master) acts as the primary source of data and is responsible for updating and maintaining the data. The other databases (the slaves) receive copies of the data from the master and can be used to read from, but not update, the data.

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In peer-to-peer replication, all databases are equal and can act as both a source and destination for data. This type of replication is often used in distributed systems where multiple databases are used to store and access data from multiple locations.

In snapshot replication, the entire database is copied at a specific point in time and transferred to the other database. This can be used to create backups or to quickly transfer large amounts of data between databases.


14. What is a database cursor?

A database cursor is a control structure that allows traversal over the rows in a database result set. It allows the programmer to move through the rows one at a time and perform specific actions on each row. Cursors are often used when working with large datasets or when data needs to be updated in real-time.


15. What is a database trigger?

A database trigger is a piece of code that is automatically executed by the DBMS in response to certain events, such as the insertion, update, or deletion of data. Triggers can be used to enforce data integrity, update other tables, or perform other tasks.


16. What is a database stored procedure?

A database stored procedure is a pre-compiled piece of code that is stored in the database and can be called by the DBMS or application. Stored procedures can be used to perform complex tasks or to encapsulate business logic, improving the performance and maintainability of the database.


17. What is a database view?

A database view is a virtual table that is created based on a SELECT statement. It does not store data itself, but rather displays data from one or more tables in a specific way. Views can be used to simplify complex queries and provide a specific view of the data to users.


18. What is database security?

Database security is the process of protecting a database and its data from unauthorized access or modification. This includes measures such as authentication, access control, encryption, and backup and recovery. Ensuring the security of a database is important to protect sensitive data and maintain the integrity and availability of the database.


19. What is a database transaction?

A database transaction is a unit of work that is performed against a database. It consists of one or more database operations, such as insert, update, or delete, that are executed as a single unit. Transactions ensure that the database remains in a consistent state, even if there are errors or failures during the transaction.


20. What is a database constraint?

A database constraint is a rule or condition that is enforced by the DBMS to ensure the integrity and accuracy of the data in a database. Examples of constraints include primary keys, foreign keys, and unique constraints.


21. What is a database normal form?

A database normal form is a level of organization for a database that reduces redundancy and dependency. There are several different normal forms, including first normal form (1NF), second normal form (2NF), and third normal form (3NF). Each successive normal form builds upon the previous one, with higher normal forms generally resulting in more efficient and normalized databases.


22. What is a database schema?

A database schema is the structure of a database, which defines the types of data that can be stored in the database and the relationships between those data. It includes the database’s tables, fields, and the relationships between them.

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23. What is database normalization?

Database normalization is the process of organizing a database in a way that reduces redundancy and dependency. It involves dividing a large table into smaller tables and establishing relationships between them. This helps to eliminate data redundancy and improve the overall efficiency and integrity of the database.


24. What is database concurrency control?

Database concurrency control is the process of managing access to a database by multiple users or processes in a way that ensures data consistency and integrity. It involves techniques such as locking, versioning, and two-phase commit to prevent conflicts and ensure that data is not lost or corrupted.


25. What is a database lock?

A database lock is a mechanism that is used to prevent multiple users or processes from accessing the same data simultaneously. Locks can be applied to a variety of levels, such as rows, tables, or entire databases, and can be either shared or exclusive.


26. What is a database deadlock?

A database deadlock is a situation that occurs when two or more transactions are waiting for each other to release locks, resulting in a standstill. Deadlocks can be caused by improper lock ordering or by the use of inappropriate lock granularity.


27. What is a database transaction isolation level?

A database transaction isolation level is a setting that determines how a transaction interacts with other transactions and the data they access. Different isolation levels offer varying levels of protection against conflicts and data inconsistencies, with higher levels offering more protection but potentially lower performance.


28. What is a database two-phase commit?

A database two-phase commit is a protocol that is used to ensure the consistency and integrity of data in a distributed database. It involves two phases: the preparation phase, in which the changes to be made are prepared, and the commit phase, in which the changes are made permanent. The two-phase commit ensures that all changes are either committed or rolled back, ensuring the consistency of the data across all nodes in the distributed database.


29. What is a database materialized view?

A database materialized view is a pre-computed view of data that is stored in the database. It is created based on a SELECT statement and can be used to improve the performance of queries that access large amounts of data. Materialized views can be used to reduce the load on the database server by pre-computing the results of expensive queries and storing them in the database.


30. What is a database stored procedure?

A database stored procedure is a pre-compiled piece of code that is stored in the database and can be called by the DBMS or application. Stored procedures can be used to perform complex tasks or to encapsulate business logic, improving the performance and maintainability of the database.


Thank you for reading this DBMS interview questions and answers. We hope that it has provided you with some useful information and helped you prepare for your next DBMS interview. These are just a few of the many DBMS interview questions you might encounter during your interview. By reviewing these questions and practicing your answers, you can increase your chances of success and land your dream job.

All The Best!

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