DBS-C01 Monitoring and Troubleshooting Practice Question
A database administrator notices that an Amazon RDS for Oracle DB instance's CPU utilization is consistently above 90% during peak hours. The application is read-heavy. Which action can reduce CPU load?
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
✓
Create a read replica and direct read traffic to it
Creating a read replica offloads read traffic from the primary instance, reducing CPU utilization. For a read-heavy workload, this is an effective scaling strategy. Option A is incorrect because disabling Multi-AZ does not free up significant resources and reduces availability. Option B (increase storage) does not directly reduce CPU load; it addresses storage capacity. Option C (Performance Insights) helps identify performance bottlenecks but does not reduce CPU load by itself.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable Multi-AZ to free up resources
Why it's wrong here
Multi-AZ is for high availability, not performance; disabling it does not reduce CPU.
- ✗
Increase the allocated storage
Why it's wrong here
Increasing storage does not directly reduce CPU utilization.
- ✗
Enable Performance Insights to optimize queries
Why it's wrong here
Performance Insights helps with analysis but does not reduce CPU load.
- ✓
Create a read replica and direct read traffic to it
Why this is correct
Offloading reads to a read replica reduces CPU load on the primary instance.
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