- A
Monitor the 'Evictions' metric in Amazon CloudWatch for the ElastiCache cluster.
CloudWatch provides the evictions metric which tracks the number of evicted keys.
- B
Check the ElastiCache event history for eviction events.
Why wrong: ElastiCache events do not include key-level eviction details.
- C
Enable the 'INFO' command output to be logged to CloudWatch Logs.
Why wrong: INFO output is not automatically logged; you would need to poll it.
- D
Enable the Redis slow-log to capture eviction commands.
Why wrong: Slow-log captures commands that exceed a latency threshold, not evictions.
Question 971 of 1,730
Monitoring Cache Evictions in ElastiCache for Redis
This DBS-C01 practice question tests your understanding of management and operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may 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.
Trap categories for this question
Command / output trap
INFO output is not automatically logged; you would need to poll it.
Detailed technical explanation
How to think about this question
Under the hood, Redis evicts keys when the memory usage exceeds the 'maxmemory' limit, using an algorithm like allkeys-lru or volatile-ttl. The 'Evictions' metric in CloudWatch is published every minute from the Redis 'INFO stats' section, specifically the 'evicted_keys' counter, and provides a time-series view of eviction rates. In a real-world scenario, a sudden spike in evictions often indicates that the cluster's 'maxmemory' is set too low or that a new workload pattern is generating more cache entries than expected, requiring either scaling up the node type or adjusting the eviction policy.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Management and Operations — This question tests Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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