beginnerDatabases & Storage

What is the difference between SQL (RDBMS) and NoSQL databases?

Tests whether you know the schema, scaling, and consistency tradeoffs, not just 'SQL is relational, NoSQL isn't.'

Ready to design this system end to end?

Generate a complete, structured system design answer — requirements, capacity estimation, API design, architecture, database choice, scaling, caching, fault tolerance, security, trade-offs, and more, walked through the way a strong senior engineer would in a real interview.

Next Step

Continue to Walk through an e-commerce order flow using Choreography Saga — Order Service → Payment Service → Inventory Service. →← Back to all System Design (HLD) questions