SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company uses Amazon RDS for MySQL with Multi-AZ deployment. The database experiences occasional read replica lag of up to 5 seconds. The application requires read-after-write consistency. Which action should the company take to improve the solution?
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
✓
Modify the application to always read from the primary instance.
Reading from the primary instance ensures read-after-write consistency. Since the application requires strong consistency, all reads must be directed to the primary, as read replicas may have lag. Option B is incorrect because increasing the number of read replicas does not reduce replication lag. Option C is incorrect because Amazon ElastiCache is a caching layer, not a solution for consistency. Option D is incorrect because Amazon RDS Proxy helps manage connections but does not eliminate read replica lag.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Modify the application to always read from the primary instance.
Why this is correct
Primary instance provides strong consistency.
- ✗
Increase the number of read replicas to distribute the load.
Why it's wrong here
More replicas do not reduce lag.
- ✗
Implement Amazon ElastiCache to cache read results.
Why it's wrong here
Caching may serve stale data.
- ✗
Use Amazon RDS Proxy to route read queries to the read replica.
Why it's wrong here
RDS Proxy does not guarantee read-after-write consistency.
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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.