beginnerNoSQL Fundamentals — CAP, BASE & Eventual Consistency

What is polyglot persistence and when do you apply it?

Polyglot persistence: using multiple different databases within the same application, each chosen for its specific strengths. Example: e-commerce platform: MySQL/PostgreSQL for orders and transactions (ACID required); MongoDB for product catalog (flexible schema for different product types); Redis for sessions and cart (fast key-value); Elasticsearch for product search (full-text); Cassandra for c

Ready to master this question?

Generate a complete walkthrough — background, the full answer in plain language, a working code example explained line by line, a real-world scenario, common mistakes, and how this same question gets asked in different ways.

Next Step

Continue to You're designing a global e-commerce platform. The product catalog needs flexible schemas (different attributes per product type). Orders must be ACID-compliant. The recommendation engine needs to query relationships between users and products. What databases do you choose? →← Back to all NoSQL questions