Cianplan

Level 4: Reliability, security & cloud · L4.6 AWS architecture decisions (SAA-C03)

Managed databases: failover, read scaling and capacity

Distinguish RDS Multi-AZ from read replicas, and choose Aurora features, RDS Proxy, DynamoDB capacity modes, DAX and global tables for availability, performance and cost.

13 min · Pro

What you take away

  • Classic RDS Multi-AZ is a synchronous standby for failover only: it never serves reads, so it adds availability, not capacity.

And 3 more inside the class, in Pro.

How the class is laid out

  1. The problem
  2. Same mechanisms, AWS names
  3. When the data is key-value
  4. Check your understanding