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Database Administrator interview questions & mock practice

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What interview questions are asked for a Database Administrator?

A Database Administrator interview in 2026 runs across 4 rounds — dbms fundamentals, administration round, performance tuning, ha & scenario. Below are the most-asked Database Administrator interview questions and a focused prep plan. Rehearse every answer out loud with the free timed practice below before the real one.

  • SQL
  • Database Administration
  • Backup & Recovery
  • Performance Tuning
  • Indexing
  • Replication
  • Oracle / MySQL

Free interview practice · Database Administrator

Practise your Database Administrator interview now — free

Step through the 12 most-asked Database Administrator questions one at a time, under a timer, just like the real thing. Jot your answer, then reveal what a strong answer covers. No signup needed to practise.

Interview rounds

The Database Administrator interview process

Database administration, backups, performance tuning and high availability — the DBA interview for enterprises, banks and data-heavy teams.

1. DBMS fundamentals

Architecture, ACID, indexing and normalisation.

2. Administration round

Backups, recovery, users, roles and security.

3. Performance tuning

Query optimisation, execution plans and indexing strategy.

4. HA & scenario

Replication, clustering and a recovery scenario.

Most-asked questions

Most-asked Database Administrator interview questions

12 of the questions Database Administrator candidates are asked most often in India. Practise answering each one out loud in the timed practice above.

  1. 1. What are the ACID properties of a transaction?
  2. 2. Explain the difference between clustered and non-clustered indexes.
  3. 3. What is the difference between a full, differential and incremental backup?
  4. 4. How do you recover a database to a point in time?
  5. 5. What is database normalisation, and when would you denormalise?
  6. 6. Explain transaction isolation levels and what problems each prevents.
  7. 7. What is a deadlock, and how do you detect and resolve it?
  8. 8. How do you identify and fix a slow-running query?
  9. 9. What is replication, and what is the difference between synchronous and asynchronous replication?
  10. 10. How do you manage users, roles and permissions in a database?
  11. 11. What is the difference between DELETE, TRUNCATE and DROP?
  12. 12. How do you monitor database health and plan for capacity?
How to prepare

How to prepare for your Database Administrator interview

Know DBMS internals: indexing (clustered vs non-clustered), ACID, isolation levels and how the optimiser works.

Be confident on backup and recovery strategies — full/differential/incremental and point-in-time recovery.

Practice performance tuning: reading execution plans, spotting missing indexes and rewriting slow queries.

Understand high availability: replication, log shipping, clustering and failover.

Be ready for a recovery scenario and know your platform (Oracle, SQL Server, MySQL or PostgreSQL) well.

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Interview prep guides

Database Administrator interview — FAQs

What questions are asked in a Database Administrator interview?

Common Database Administrator interview questions include: What are the ACID properties of a transaction? Explain the difference between clustered and non-clustered indexes. What is the difference between a full, differential and incremental backup? How do you recover a database to a point in time? Interviews usually run across 4 rounds — DBMS fundamentals, Administration round, Performance tuning, HA & scenario. Practise them with the free timed practice on this page.

How many rounds are in a Database Administrator interview?

A typical Database Administrator interview has 4 rounds: DBMS fundamentals (Architecture, ACID, indexing and normalisation.); Administration round (Backups, recovery, users, roles and security.); Performance tuning (Query optimisation, execution plans and indexing strategy.); HA & scenario (Replication, clustering and a recovery scenario.).

How do I prepare for a Database Administrator interview?

To prepare for a Database Administrator interview: Know DBMS internals: indexing (clustered vs non-clustered), ACID, isolation levels and how the optimiser works. Be confident on backup and recovery strategies — full/differential/incremental and point-in-time recovery. Practice performance tuning: reading execution plans, spotting missing indexes and rewriting slow queries. Then rehearse every question out loud with the timed practice on this page before the real thing.

What skills do I need for a Database Administrator role?

Core Database Administrator skills tested in interviews include SQL, Database Administration, Backup & Recovery, Performance Tuning, Indexing, Replication, Oracle / MySQL. OnJob shows you exactly which of these skills stand between you and a 100% match on every live Database Administrator job.

Is the Database Administrator mock interview practice free?

Yes. The questions, the answer guidance and the timed practice on this page are free and need no signup. With a free OnJob account you can also take timed role tests and free certification tests. Personalised AI role and skill tests are part of the paid plans.

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Rehearse every Database Administrator question out loud on this page, then sign in to take a timed role test or a free certification in the OnJob practice hub.

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