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Database Interview Questions & Answers

Database Technical Interview Questions

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How would you model a many-to-many relationship between students and courses?

Create students and courses tables plus an enrollment table containing foreign keys to both. Add a primary key or unique constraint on the student-course pair if only one enrollment is permitted. Attr...

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Why can a replica return stale data immediately after a successful write?

Many replication designs apply changes to replicas asynchronously, so a committed primary write may not yet be visible there. A user who creates a record and immediately reads from a replica can see a...

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How would you verify that a database backup is usable?

Restore it into an isolated environment with compatible software and required encryption keys, then check structural integrity and important application-level invariants. Verify expected tables, repre...

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When would you choose relational storage over a document database for a new application?

Start with data relationships, transaction boundaries, integrity requirements, query patterns, and operational skills. Relational storage often fits strongly related entities and cross-entity constrai...

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