DBS-C01 Monitoring and Troubleshooting Practice Question
A company is using Amazon ElastiCache for Redis to cache frequently accessed data. Recently, the application has been experiencing increased latency. The database specialist suspects that the cache hit ratio has decreased. Which CloudWatch metric should the specialist analyze to confirm this suspicion?
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
✓
Monitor 'CacheHits' and 'CacheMisses' metrics to calculate the hit ratio.
The cache hit ratio is calculated as CacheHits / (CacheHits + CacheMisses). Monitoring the 'CacheHits' and 'CacheMisses' CloudWatch metrics allows the specialist to compute the hit ratio and confirm whether it has decreased, which would explain increased latency. Option A is incorrect because CurrConnections shows the number of connections, not the cache hit ratio. Option B is incorrect because Evictions indicates keys being evicted, which can affect the cache but does not directly measure the hit ratio. Option D is incorrect because ReplicationLag measures replication delay, not cache performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Monitor the 'CurrConnections' metric to see if there are too many connections.
Why it's wrong here
CurrConnections shows the number of connections, not cache hit ratio.
- ✗
Monitor the 'Evictions' metric to see if keys are being evicted.
Why it's wrong here
Evictions indicate memory pressure, not directly cache hit ratio.
- ✓
Monitor 'CacheHits' and 'CacheMisses' metrics to calculate the hit ratio.
Why this is correct
Cache hit ratio = CacheHits / (CacheHits + CacheMisses).
- ✗
Monitor the 'ReplicationLag' metric to check replication delay.
Why it's wrong here
ReplicationLag is for replication health, not cache hit ratio.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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