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Quiz: Databases at Scale

5 questionsNo time limitPass: 60%+10 XP on first pass

How databases handle millions of users: read replicas, sharding strategies, choosing SQL or NoSQL, the CAP theorem, and consistency trade-offs — explained with pictures.

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  1. Question 1

    Read replicas mainly increase:

  2. Question 2

    Splitting users across several databases by user_id is called:

  3. Question 3

    During a network partition, a banking system should usually choose:

  4. Question 4

    What is replication lag?

  5. Question 5

    Which is a good use case for NoSQL?