Definition:
he Read-Replica Pattern is a database architecture where you have one primary (master) database that handles all writes, and multiple read-only copies (replicas) that handle read queries. This separates read and write operations to improve performance and scalability.
How It Works Primary database: Handles all INSERT, UPDATE, DELETE operations Read replicas: Handle all SELECT queries Data synchronization: Changes flow from primary to replicas Load distribution: Spread read traffic across multiple replicas
Example:
E-commerce Website
👥 Users writing reviews/orders ──► 📊 Primary DB (Writes only)
│
├── Sync ──► 📖 Read Replica 1
├── Sync ──► 📖 Read Replica 2
└── Sync ──► 📖 Read Replica 3
â–²
👥 Users browsing products ──────────────────────┘
(Product listings, search, reviews)