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Aurora AWS-managed relational database (MySQL/PostgreSQL compatible) with cloud-native architecture. Storage and compute are separated. Aurora Cluster (Single Region) One primary instance (read/write) + optional read replicas sharing the same storage. Writer Endpoint Reader Endpoint │ │ ▼ ▼ ┌──────────────┐ ┌──────────────┬──────────────┐ │ Primary │ │ Replica 1 │ Replica 2 │ │ (Writer) │ │ (Reader) │ (Reader) │ └──────┬───────┘ └──────┬───────┴──────┬───────┘ │ │ │ └─────────────┬───────────────┴──────────────┘ ▼ ┌────────────────────────────────────────┐ │ Shared Cluster Storage │ │ (6 copies across 3 AZs) │ │ Auto-grows up to 128 TB │ └────────────────────────────────────────┘ All instances share same storage (no replication lag for storage) Replicas can be promoted to primary if primary fails (~30 seconds failover) Up to 15 read replicas Single region only Aurora Storage One logical storage automatically replicated across 3 AZs (6 copies total, 2 per AZ). ...