Question 71 of 1,663
DBS-C01 Monitoring and Troubleshooting Practice Question
A company is using Amazon RDS for MySQL and has enabled Enhanced Monitoring. The database administrator wants to identify the top contributors to disk I/O. Which THREE metrics from Enhanced Monitoring should they examine?
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
✓
DirtyBufferFlushRate
(DirtyBufferFlushRate) is correct because it indicates the rate at which dirty (modified) buffers are flushed from memory to disk, directly contributing to disk writes and I/O. Option D (WriteOps) is correct as it measures the number of write operations performed on disk, a direct contributor to disk I/O. Option E (PhysicalReads) is correct because it represents read operations that actually hit the disk (i.e., cache misses), contributing to disk I/O. Options B (NetworkThroughput) and C (LogicalReads) are incorrect: NetworkThroughput relates to network traffic, not disk I/O; LogicalReads are reads satisfied from the buffer pool (memory), not disk.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DirtyBufferFlushRate
Why this is correct
Indicates how often dirty buffers are written to disk.
- ✗
NetworkThroughput
Why it's wrong here
Network throughput is not disk I/O.
- ✗
LogicalReads
Why it's wrong here
Logical reads are from memory, not disk.
- ✓
WriteOps
Why this is correct
Measures the number of write operations.
- ✓
PhysicalReads
Why this is correct
Directly measures disk read operations.
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Last reviewed: Jun 20, 2026
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