Databases in System DesignInterview Readiness Check

Learning path

Try a sample question

What this module tests

• Conceptual understanding of databases fundamentals
• Trade-offs and design decisions in real system scenarios
• sql and nosql — applied knowledge
• Interview-style reasoning and explanation quality

Frequently asked questions

What does the Databases check test?

The check covers sql vs nosql, indexing, replication, sharding strategies. Questions span beginner to advanced difficulty and test both conceptual understanding and practical trade-off reasoning.

What keywords should I know for Databases?

Key concepts include: sql, nosql, database, indexing, sharding, replication, storage. These frequently appear in system design interviews at product and infrastructure companies.

How many questions are in the check?

Each check has 10 questions — a mix of MCQ and short-answer. You get scored by dimension (e.g., scalability, consistency) so you know exactly where to focus.

How long does it take to study Databases?

Most engineers spend around 4 hours on this module. The check itself takes about 10–15 minutes. You can retake it up to 3 times per day.

What prerequisite knowledge do I need before Databases?

Databases builds on Fundamentals. Complete those first for the best results.

Is sql, nosql, database covered?

Yes. The Databases module covers sql, nosql, database among other key concepts. The check includes questions that reflect real system design interview patterns.

What this unlocks