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Check our curated list of full-stack, data structures & software architecture interview questions and answers for developers

Databases interview questions

Databases interview questions.

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  • 1.

    What is Normalization?

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  • 2.

    What are the advantages of NoSQL over traditional RDBMS?

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  • 3.

    What is the difference between Data Definition Language (DDL) and Data Manipulation Language (DML)?

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  • 4.

    Define ACID Properties

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  • 5.

    What is Denormalization?

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  • 6.

    What are the difference between Clustered and a Non-clustered index?

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  • 7.

    How a database index can help performance?

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  • 8.

    What's the difference between a Primary Key and a Unique Key?

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  • 9.

    When would you use NoSQL?

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  • 10.

    When should I use a NoSQL database instead of a relational database?

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  • 11.

    What is Optimistic Locking?

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  • 12.

    What Is ACID Property Of A System?

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  • 13.

    What is the cost of having a database index?

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  • 14.

    How does B-trees Index work?

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  • 15.

    Explain the difference between Exclusive Lock and Update Lock

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  • 16.

    How do you track record relations in NoSQL?

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  • 17.

    Explain eventual consistency in context of NoSQL

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  • 18.

    What Is Sharding?

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  • 19.

    What is BASE property of a system?

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  • 20.

    How do you off load work from the Database?

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  • 21.

    What is Optimistic Locking and Pessimistic Locking?

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  • 22.

    How does database Indexing work?

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  • 23.

    What are some other types of Indexes (vs B-Trees)?

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  • 24.

    Name some disadvantages of a Hash index

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  • 25.

    Explain the differences in conceptual data design with NoSQL databases?

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  • 26.

    What Does Eventually Consistent Mean?

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  • 27.

    Is the C in ACID is not the C in CAP?

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  • 28.

    How do you make schema changes to a live database without downtime?

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  • 29.

    Why you should never use GUIDs as part of clustered index?

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  • 30.

    What is the difference between B-Tree, R-Tree and Hash indexing?

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  • 31.

    What is Index Cardinality and why does it matter?

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