DBS-C01 Monitoring and Troubleshooting Practice Question
A company is using Amazon ElastiCache for Redis as a caching layer. The application performance degrades when cache misses increase. Which metric should be monitored to track the cache hit rate?
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
✓
CacheHits and CacheMisses
CacheHits and CacheMisses. The cache hit rate is calculated as CacheHits / (CacheHits + CacheMisses), so monitoring both metrics is essential. Option A (CurrConnections) tracks active connections, not hit rate. Option C (CPUUtilization) reflects resource usage. Option D (Evictions) indicates memory pressure but does not directly measure hit rate.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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CurrConnections
Why it's wrong here
CurrConnections shows number of client connections.
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CacheHits and CacheMisses
Why this is correct
CacheHits and CacheMisses are used to calculate hit rate.
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CPUUtilization
Why it's wrong here
CPUUtilization does not indicate cache hit rate.
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Evictions
Why it's wrong here
Evictions measure items removed due to memory pressure.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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