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Database Administrator (DBA) interview questionsDatabase Design Test round
A 60 min interview plan with a time-boxed script, what each question is for, and the signals to score against. Key skills: Database Design, Normalization, ER Diagrams, Data Modeling, Schema Creation.
Opening
· 5 minWho is interviewing, how the round will run, and a question to settle the candidate in. The standard openingDatabase Design Challenge
What this part is for
Purpose
Evaluate technical knowledge and problem-solving skills in real-world scenarios related to database design, normalization, ER diagrams, data modeling, and schema creation.
Design a database schema for a library management system. The system should handle books, authors, members, and loans. Consider relationships, normalization, and constraints.
What this question is for, and what to listen for
Purpose
Assess the candidate's ability to design a normalized database schema, create ER diagrams, and apply data modeling principles.
Signals to score
- Clear understanding of entities and relationships
- Proper use of normalization
- Logical and structured approach
- Considers constraints and keys
- Efficient schema design
- Explains thought process
- Open to feedback and adjusts accordingly
Follow-up questions
- What entities do you think are necessary for this system?
- How would you define the relationships between these entities?
- Can you explain your thought process on normalization?
- How would you ensure data integrity in this schema?
If you had more time, what would you change in your design?
What this question is for, and what to listen for
Purpose
Assess the candidate's ability to reflect on their work, identify areas for improvement, and demonstrate critical thinking and problem-solving skills.
Signals to score
- Recognizes limits in their original design
- Points out clear areas to improve
- Suggests specific changes
- Talks about how changes could help performance
- Shares ideas clearly and logically
- Shows a desire to learn and improve
Follow-up questions
- How could you improve the scalability of your design?
- Are there any additional constraints you would consider adding?
- What potential issues could arise with your current design?
Great job on the database design challenge!
What this line is for
Purpose
Provides positive reinforcement to the candidate, helping to build confidence and create a supportive atmosphere before moving into the final part of the interview.
Closing
· 5 minTheir questions for you, and what happens next. The standard closingDatabase Administrator (DBA) interviews — common questions
- Who is this Database Administrator (DBA) interview plan for?
- It is written for the interviewer, not the candidate: the hiring manager, engineer or panel member running the Database Design Test round for a Database Administrator (DBA) role. It gives you a 60 min script to follow in the conversation — 2 questions with what each one is for and the signals to score against — so you are not writing the round from scratch the night before.
- What does the Database Design Test round assess?
- This round is focused on: Database Design, Normalization, ER Diagrams, Data Modeling, Schema Creation. It works through Database Design Challenge, scoring against 13 observable signals, with follow-up prompts on both questions for going deeper where an answer is thin.
- How is the 60 min split up?
- 5 min opening, 50 min on 2 questions and 5 min closing. The questions take in Database Design Challenge (50 min). The timings are there so the round stays on schedule and every candidate gets the same shape of interview — which is what makes two candidates comparable afterwards.
- What other rounds should I run for a Database Administrator (DBA)?
A single round does not cover a whole role. The other rounds in this library for a Database Administrator (DBA):
Hiring for this role?
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- Every interviewer runs the same script and marks the same signals.
- AI drafts the write-ups, and the debrief puts every read side by side.
- No ATS to set up first, and no bot in the call.
Free for your first open role.