32 Database Design Interview Questions and Answers

Database Design Interview Questions and Answers

Data collection and analysis is an important part of many businesses’ operations. Because of this, companies often look for employees with expertise in database design and maintenance of data management systems. If you are planning to interview for a position in database administration or data management, it may be helpful to learn some of the questions you may encounter. In this article, we’ll explore 32 common database design interview questions and provide some sample answers to help you create your own.

26 General Database Design Interview Questions

Here are 26 more database design interview questions you may encounter:

  1. What is the structure of the database?
  2. How would you explain the iconic model?
  3. What is a CAP sentence and what are its components?
  4. Explain the difference between AP and CP databases.
  5. Explain horizontal scaling and describe its advantages and disadvantages.
  6. What is vertical scaling? What advantages and disadvantages does it bring?
  7. What is a relational database and when would you use it?
  8. How would you explain a non-relational database?
  9. What are some types of non-relational databases?
  10. List some types of database keys.
  11. Explain your work to date in database design.
  12. How would you explain the scheme?
  13. What are the different schemas commonly used by database designers?
  14. What are the five primary types of dimension?
  15. Explain the difference between DBMS and RDBMS.
  16. Explain how normalization and denormalization apply to database design.
  17. How would you explain scalar and aggregation functions?
  18. What is OLTP?
  19. What is OLAP and how does it differ from OLTP?
  20. What is shift sensitivity and what are the different types?
  21. Define the terms “table” and “array” as they are used in data collection and storage.
  22. Explain the backup procedures you can use to prepare for data loss.
  23. What DBMS do you know?
  24. What is a clustered index versus a non-clustered index?
  25. Define the terms “query” and “subquery”.
  26. Describe some major benefits of Database.

06 Database Design Interview Questions with Model Answers

1. How would you describe database design and its role in business?

This is a general question that interviewers may ask at the beginning of an interview. The purpose of this question is often to assess your understanding of basic database design concepts and to learn about your approach to work. This question can also help interviewers determine how your approach to database design can contribute to the company’s overall success.

When answering this question, it is often helpful to avoid specifics and focus on the role of data and databases in today’s business environment. You can briefly explain why companies collect data and why it is important. You can then describe how databases and database designers enable businesses to make better use of the data they collect.

Example Answer: “Database design is a technique that professionals like me use to create a detailed data model of a database. This includes physical and logical design decisions, such as setting the physical storage parameters required to develop the design in the data definition language. I can then use this information to generate a new database.

Throughout this process, I consider various elements such as data availability, data replication, database partitioning, data backup, and system security. The purpose of this process in business is to identify the relationships between different entities in the data and to normalize the data so that the company can understand, manage and analyze the patterns in its data.

2. In general, what are the main steps in database design?

Database design generally takes place in three phases, and knowledge of these steps is essential for employees working in the field. This general question can help interviewers gauge your knowledge of important database design concepts. It can also give them an impression of ​​how you might plan building a database if the company appoints you.

When answering this question, it is often helpful to demonstrate your knowledge while keeping the answer brief. This can show employers that you are ready to move on to more advanced topics. You might start by describing the three primary steps in database design and then explain why those steps are important.

Example Answer: “Database design generally consists of three phases. The first phase is the conceptual database design, in which we build a conceptual model of the data system. This includes identifying the entities within the data ecosystem, as well as their relationships and attributes. The second phase is the logical database design .In this phase we select the data model and convert the conceptual model into a logical framework.

The final step in database design is the creation of a physical database model. In this phase, we find ways to physically implement the logic model. This includes selecting a database management system, establishing security measures, and developing storage mechanisms and file organization systems.”

3. What is a logical model and what are the steps of its development?

A logical database model is often the second step in developing a database solution. It allows designers to apply a certain data model to their concept before designing a database that meets the company’s needs. Hiring managers may ask you this question to gauge your understanding of how to complete this important task.

In answering this question, you can briefly describe what a logic model is. You can then continue by explaining what role it plays in the database design process. Finally, you can outline the steps you would take to create a logic model. This can help you show interviewers that you have a lot of experience in this field, 

Example Answer: “A logical database model, also called a logical schema, is a data model that focuses on a specific problem domain expressed separately from a specific database storage technology or management product. This model uses data structures such as object-oriented classes, relational tables and columns, or XML tags to carry information.

I can use seven steps to create one. I define the goals for the design of the logical database model, then analyze the existing database, create the database structure, and establish the table relationships of the model. The last three steps then involve identifying and outlining the business rules of the model, defining views of the database model, and finally checking the integrity of the schema I created.

4. Explain what a conceptual database model is and explain its characteristics.

Creating a conceptual database model is often the first stage of database design. Provides a general overview of database requirements. Understanding conceptual database models is an important skill for professionals working in database design, and your answer to this question can help interviewers understand your qualifications in this area. As you answer this question, consider starting with a brief description of what a conceptual database model is and what role it plays in the database design process. Next, you can explain some of the primary functions that a conceptual model needs to be effective.

Example Answer: “The conceptual database model is an explanation of the company’s database necessities, which I can then use to enterprise and appliance a database that takes into account its primacies and favorites. This model typically includes the primary concepts that the business wants to focus on and the relationships between those concepts.

The basic purpose of this kind of model is to provide a data-centric view of the company. It does this by analyzing the interrelationship of various organizational units to support business processes and by recording internal business events. Instead of trying to understand the physical characteristics of the database or the processing flow, this model focuses only on recognizing the data used within the organization. The primary features of the conceptual database model include data types, names and characteristics of business entities and their qualities.

5. What is a physical database model and how can you design one?

Physical database prototypes are often the final phase of database design. These models represent actual database structures and combine the logical and conceptual components of the design. Completing the physical database model is one of the most important tasks for a database designer, and interviewers may ask you this question to gauge your expertise in the field. Your answer can also help them better understand how you might perform if the company hires you.

In answering this question, you can start by describing the concept of a physical database model. You can then describe what role it plays in the database design process. Finally, you can briefly describe the steps you can take to create a physical database model. If you have completed one in the past, you can include details to demonstrate your experience.

Example Answer: “A physical database type is a database-specific tool that contains all the logical database features that experts want to form a database, such as column name, column data type, primary key, foreign key, column constraints, and table relationships. . This model represents data design as professionals have implemented it or hope to implement it in a database management system. Depending on the project, it can be derived from a logical database model.

I follow a series of eight steps to create a physical database model. I identify the tables and normalize them, then define the columns and review the stored procedures. Next, I apply naming conventions according to the organization’s standards and guidelines, and then identify the relationships between the tables. Finally, I use the data model patterns and assign the appropriate keys.”

6. What are the properties of the physical database model?

A physical database typically has several distinct characteristics that separate it from logical and conceptual database models. It is important for database designers to understand these features in order to incorporate them into their designs. When asked this question, interviewers often test your knowledge of common database design concepts and your ability to apply them in practice.

When answering this question, it is often helpful to offer accurate but concise information. Try to list four or five attributes that are important to physical database models. If you have extra time, you might consider describing why these attributes are important and what role they play.

Example Answer: “A physical database model is a blueprint for how to implement a logical model in a real-world environment. There are numerous structures that differentiate physical models from logical models. First, they are DBMS-specific, while logical models are DBMS-independent. Physical database models also specify storage structures, access methods, security features, table structures, and table constraints. All of these elements are part of creating a functional and secure database that professionals can use in a work environment.”

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