DBS-C01 Management and Operations Practice Question
A company uses Amazon ElastiCache for Redis as a caching layer for its e-commerce application. Recently, the cache hit ratio has dropped significantly, causing increased database load. The operations team needs to identify which cache keys are being evicted. What should they do?
⚠ Common exam trap
Candidates often confuse event history (cluster-level events) with data-level operations (key evictions), or assume that logging the INFO command or slow-log would capture evictions, when in fact evictions are not commands and are best monitored via CloudWatch metrics.
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 the 'Evictions' metric in Amazon CloudWatch for the ElastiCache cluster.
The 'Evictions' metric in Amazon CloudWatch directly reports the number of keys evicted from the ElastiCache for Redis cluster due to memory pressure. A drop in cache hit ratio often correlates with increased evictions, and monitoring this metric allows the operations team to identify the rate at which keys are being removed. This is the standard, built-in way to observe eviction activity without additional configuration.
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 'Evictions' metric in Amazon CloudWatch for the ElastiCache cluster.
Why this is correct
CloudWatch provides the evictions metric which tracks the number of evicted keys.
- ✗
Check the ElastiCache event history for eviction events.
Why it's wrong here
ElastiCache events do not include key-level eviction details.
- ✗
Enable the 'INFO' command output to be logged to CloudWatch Logs.
Why it's wrong here
INFO output is not automatically logged; you would need to poll it.
- ✗
Enable the Redis slow-log to capture eviction commands.
Why it's wrong here
Slow-log captures commands that exceed a latency threshold, not evictions.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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