Last updated on August 5th, 2024 at 10:51 am
Are you preparing for your DBMS interview and feeling nervous? Do not worry. Impress your interviewer with your knowledge with this top DBMS interview questions list provided below. This guide explores frequently asked DBMS viva questions on core concepts like database models, normalization, and database schema.
Keep on reading and prepare yourself well for database interview questions. Showcase your expertise and land your dream DBMS job.
Top DBMS Interview Questions
Q.1 What is DBMS? Please Explain
Ans. DBMS stands for Database Management System. This is a type of software system through which users can organise, manage as well as manipulate data in a database. Database is a collection of electronically stored data and with the help of DBMS, users can interact with this data in an organised and structured way.
Q.2 What is the difference between a file system and a DBMS?
Ans. A file system provides basic operations such as reading, writing, and deleting while also organising and managing the files on a storage device. On the other hand, a DBMS or database management system provides users with a much more sophisticated data management approach. This includes security, data integrity as well as recovery mechanism. DBMS also provides crucial support for complex queries and data relationships.
Q.3 What are the various types of DBMS models?
Ans. DBMS is available to users in a variety of models like the network model, object-oriented model, hierarchical model, and object-oriented model. Every model has its key features that define how the data is connected and how it can be accessed. These models also offer different ways to store, organise and retrieve data.
Q.4 Please explain the process of Normalization in DBMS.
Ans. Normalization in DBMS is a process of organising data in a database which helps in minimising redundancy of the data. This process also helps in improving data integrity. The process of normalization divides a database into different tables and then defines or categorises the relationship between them so that data duplication and dependency can be reduced.
Q.5 Do you think that DBMS is better than traditional file systems for data storage? Please explain why.
Ans. Yes, I believe DBMS has various advantages over the traditional file system for data storage. DBMS makes data sharing easier as multiple users can access and modify data concurrently. It also reduces data duplication by storing information efficiently as compared to file systems where data redundancy control is a big issue. Moreover, DBMS enforces data integrity through constraints and validation and also offers built-in mechanisms for data backup and recovery.
Q.6 What is the concept of Database schema? Please explain
Ans. The database scheme is the skeleton structure that represents the entire database’s logical view. A database schema represents the organisation of data and also defines how their relations are associated. The database schema is created at the time of database design and therefore it does not change frequently. This schema includes indexes, tables, stored procedures, views, etc. and it defines the entities and their relationships.
Q.7 Can you explain what Queries are in DBMS?
Ans. Queries are one of the most important features of a DBMS. A query in DBMS is defined as a command or request to manipulate or retrieve data from the database. To put it simply, it is the process where the user asks the database a question or requests specified information based on certain criteria or conditions. With the help of queries, users can easily interact as well as retrieve information from the database.
Q.8 What is Data redundancy and how does DBMS minimise it?
Ans.Data redundancy in a software system can occur when the same data exists in multiple places within a database. To minimise data redundancy, DBMS organises data in a structured manner by the use of various techniques like normalization. This process helps in getting rid of unnecessary duplication and also ensures consistency in data.
Q.9 What are ACID properties in a DBMS? Please explain.
Ans. ACID properties in a DBMS help to ensure reliable processing of transactions. ACID properties include:
- Atomicity which ensures that all parts of a transaction are completed successfully
- Consistency that ensures data remains steady before and after a transaction
- Isolation that ensures independent processing of data
- Durability that makes sure the transaction remains in the system permanently
Q.10 Can you explain the concept of Big Data? How do you think DBMS can be used to handle large datasets?
Ans. Big Data are massive datasets that are too big and complex to manage through traditional relational databases. DBMS can adapt to Big Data by making use of distributed database architectures for scalability. DBMS can also leverage NoSQL databases that are designed to handle structured or semi-structured data. Moreover, DBMS can also make use of data warehousing solutions to efficiently analyse Big Data.
Conclusion
The above-mentioned DBMS interview questions give you a clear idea of what to expect in your interview. If you want to build a career in DBMS, consider enrolling in the data analytics course offered by Imarticus Learning.
With the right professional and educational guidance through this course, you can land your dream job. If you prepare well and work hard then your confidence and a genuine passion for data management will shine through!
