AWS's own cloud-optimized relational database — a supercharged version of MySQL and PostgreSQL built specifically for the cloud.

What is Aurora?

• Proprietary AWS technology (not open source)
• Fully compatible with MySQL and PostgreSQL — your app connects the same way
• Cloud-optimized for superior performance and reliability
• 5x faster than MySQL, 3x faster than PostgreSQL

The Core Difference: Aurora vs Traditional RDS

The fundamental difference is in how data is stored and replicated.

Traditional RDS — Copying

Each replica has its own separate storage. When the master updates, the data must be physically copied to every replica — this takes time and creates lag.

Master → Copy data → Replica 1 (slow)
       → Copy data → Replica 2 (slow)
       → Copy data → Replica 3 (slow)

Aurora — Shared Storage

All instances (master + replicas) point to the same shared storage volume. No copying happens — replicas see changes instantly.

Master writes to Shared Storage
              ↓
All replicas read from the SAME storage
              ↓
Everyone sees updates instantly — no lag

Aurora Architecture

                    YOUR APPLICATION
                          |
               +----------+----------+
               |                     |
       WRITER ENDPOINT         READER ENDPOINT
      (Always → Master)       (Load balanced)
               |                     |
               v                     v
          +--------+     +----+----+----+----+----+
          | Master |     | R1 | R2 | R3 | R4 | R5 |
          +--------+     +----+----+----+----+----+
               |              |    |    |    |    |
               v              v    v    v    v    v
     ============================================
     |         SHARED STORAGE VOLUME            |
     |     Auto-expanding: 10GB → 256TB         |
     |     Striped across 100s of volumes       |
     |     Self-healing + Auto-replication      |
     ============================================
                         |
          +--------------+--------------+
          |              |              |
   AZ-1: 2 copies  AZ-2: 2 copies  AZ-3: 2 copies

Key Components

• 1 Master instance — handles all write operations