SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company uses Amazon RDS for MySQL with Multi-AZ deployment. The database experiences a failover event. After the failover, the application team notices that the new primary DB instance has higher latency than expected. What is the most likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A pending modification to the DB instance was applied during failover.
The most likely cause because during a failover, any pending modifications (e.g., scaling, instance type changes) that were scheduled are applied to the new primary, which can cause a brief performance impact. This is a known behavior in AWS RDS. Option A is incorrect because read replicas in a different region do not affect latency of the primary after failover; Multi-AZ does not use read replicas. Option B is incorrect because Multi-AZ configuration is not disabled during failover; it remains enabled. Option D is incorrect because DB parameter group changes require a manual reboot, not a failover event.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The read replica in a different region is now serving traffic.
Why it's wrong here
Multi-AZ does not use cross-region read replicas.
- ✗
The Multi-AZ configuration was disabled during the failover.
Why it's wrong here
Multi-AZ remains enabled after failover.
- ✓
A pending modification to the DB instance was applied during failover.
Why this is correct
Pending modifications are applied during failover, which can cause latency.
- ✗
The DB parameter group was changed to a less efficient configuration.
Why it's wrong here
Parameter group changes require a reboot, not failover.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAP-C02 exam.