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You configured Multi-AZ for your RDS instance but failover does not happen during AZ failure. What is a likely cause?

medium📝 Debug Q6 of 15
AWS - RDS and Relational Databases
You configured Multi-AZ for your RDS instance but failover does not happen during AZ failure. What is a likely cause?
AMulti-AZ only works for read replicas
BThe instance is using a single AZ deployment
CFailover requires manual intervention
DMulti-AZ is enabled but the standby is in the same AZ
Step-by-Step Solution
Solution:

  1. Step 1: Check deployment type

    If failover does not happen, the instance might be single AZ, so no standby exists.

  2. Step 2: Verify Multi-AZ behavior

    Standby is always in a different AZ; failover is automatic; Multi-AZ is not for read replicas.

  3. Final Answer:

    The instance is using a single AZ deployment -> Option B

  4. Quick Check:

    No standby means no failover [OK]
Quick Trick: Failover needs Multi-AZ, not single AZ [OK]
Common Mistakes:
MISTAKES
  • Thinking standby can be in same AZ
  • Believing failover is manual
  • Confusing Multi-AZ with read replicas

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