DEA-C01 Data Operations and Support Practice Question
A data engineer needs to monitor the performance of an RDS for PostgreSQL database. Which THREE CloudWatch metrics are most useful for this purpose?
⚠ Common exam trap
Many exam-takers confuse storage metrics (like FreeStorageSpace) with performance metrics, or assume NetworkThroughput is a performance indicator, when in fact latency and CPU metrics directly reflect query execution health.
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
✓
CPUUtilization
CPUUtilization is a critical metric for monitoring RDS for PostgreSQL because high CPU usage can indicate inefficient queries, insufficient instance size, or contention. Sustained high CPU can lead to performance degradation and increased query latency, making it essential for capacity planning and troubleshooting.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
CPUUtilization
Why this is correct
Indicates compute load.
- ✓
DatabaseConnections
Why this is correct
Helps identify connection bottlenecks.
- ✗
FreeStorageSpace
Why it's wrong here
Indicates storage capacity, not performance.
- ✗
NetworkThroughput
Why it's wrong here
Measures network traffic, not database performance.
- ✓
ReadLatency / WriteLatency
Why this is correct
Measures I/O performance.
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