Grokking the System Design Interview, Volume II
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Netflix Recommendations: Database Schema

Step 6: Database Schema

This schema uses a hybrid approach combining relational tables for structured, consistent data and NoSQL stores for high-scale, real-time recommendation data. The relational (SQL) database ensures data integrity and easy joining of user, content, and interactions. The NoSQL stores (Cassandra/DynamoDB for key-value and wide-column data, plus Elasticsearch for search) handle large volumes and fast lookups/updates for recommendations, similarity, trends, and search.

Relational Database (SQL) Schema

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