🗃️ MongoDB Overview

• MongoDB is a fast, flexible, document-oriented NoSQL database.
• Stores data as BSON (Binary JSON), supporting rich types
• Written in C++, supports journaling for recovery.

🌟 Advantages Over SQL

• Flexible schema for unstructured data
• Horizontally scalable via sharding
• Efficient indexing and in-memory caching
• Native driver support for platforms like Node.js

📂 MongoDB Structure

🚀 Sharding & Replica Sets

• Sharding: Splits data across machines (horizontal scaling).
  • Use partial query if shards are down.
• Reader-writer locks: Multiple readers ✅, single writer at a time.
• Replica set: High availability setup
  • Primary: Accepts writes
  • Secondaries: Read-only, replicate from primary

📦 BSON Data Types