Database Selection Cheatsheet

🗄️ If you’re preparing for system design interviews or building production software, screenshot this. 📸 This is the only database selection cheat sheet you need. Stop asking “Which database is the best?” ❌ Start asking “What problem am I solving?” ✅ From transactional OLTP systems → NoSQL → Graph → Time Series → Data Warehouses → Lakehouses → Vector DBs, every database exists because it optimizes for a different trade-off. Learn the mental model once, and you’ll know why companies choose PostgreSQL over MongoDB, Redis over Cassandra, Snowflake over Databricks, or Pinecone over PostgreSQL pgvector. The best engineers don’t memorize tools. They understand the workloads. Save this. You’ll use it throughout your career. 🚀 ❤️ Follow @hackproduct for practical AI Engineering, System Design, Data Engineering, and Interview content that actually gets used in production. #SystemDesign #Database #Databases #DataEngineering #SoftwareEngineering