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Redis interview questions

Redis interview questions.

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  • 1.

    What is Redis?

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  • 2.

    Is Redis just a cache?

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  • 3.

    Does Redis persist data?

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  • 4.

    How are Redis pipelining and transaction different?

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  • 5.

    What's the advantage of Redis vs using memory?

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  • 6.

    When to use Redis Lists data type?

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  • 7.

    When to use Redis over MongoDB?

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  • 8.

    When to use Redis Sets?

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  • 9.

    Does Redis support transactions?

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  • 10.

    How does Redis handle multiple threads (from different clients) updating the same data structure in Redis?

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  • 11.

    What is the difference between Redis replication and sharding?

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  • 12.

    How can I exploit multiple CPU/cores for Redis?

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  • 13.

    When to use Redis Hashes data type?

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  • 14.

    How would you efficiently store JSON in Redis?

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  • 15.

    What do the terms "CPU bound" and "I/O bound" mean in context of Redis?

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  • 16.

    Explain a use case for Sorted Set in Redis

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  • 17.

    If there's a way to check if a key already exists in a Redis list?

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  • 18.

    What is Pipelining in Redis and when to use one?

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  • 19.

    Why Redis does not support roll backs?

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  • 20.

    What is AOF persistence in Redis?

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  • 21.

    What happens if Redis runs out of memory?

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  • 22.

    What are the underlying data structures used for Redis?

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  • 23.

    How much faster is Redis than MongoDB?

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  • 24.

    RDB and AOF, which one should I use?

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  • 25.

    Is Redis a durable datastore ("D" from ACID)?

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