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An RDS Multi-AZ instance fails to failover during a primary AZ outage. You find the standby is unhealthy. What should you do?

medium📝 Debug Q7 of 15
AWS - RDS and Relational Databases
An RDS Multi-AZ instance fails to failover during a primary AZ outage. You find the standby is unhealthy. What should you do?
ACheck and fix standby instance health or recreate Multi-AZ setup
BReboot the primary instance only
CDisable Multi-AZ to fix the issue
DSwitch to a read replica for failover
Step-by-Step Solution
Solution:

  1. Step 1: Diagnose standby health

    Failover depends on a healthy standby; if unhealthy, fix or recreate Multi-AZ setup.

  2. Step 2: Avoid incorrect fixes

    Rebooting primary won't help standby; disabling Multi-AZ removes failover; read replicas differ from Multi-AZ.

  3. Final Answer:

    Check and fix standby instance health or recreate Multi-AZ setup -> Option A

  4. Quick Check:

    Healthy standby needed for failover [OK]
Quick Trick: Standby health is key for failover [OK]
Common Mistakes:
  • Rebooting primary only
  • Disabling Multi-AZ instead of fixing
  • Confusing read replicas with Multi-AZ

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