DBS-C01 Management and Operations Practice Question
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 is using Amazon ElastiCache for Redis to cache database query results. The application team reports that cache hit ratio has dropped significantly. What is the first step to investigate?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the CacheHitRate and Evictions metrics in CloudWatch
When the cache hit ratio drops significantly, the first step is to investigate whether the cache is evicting keys due to memory pressure or if the working set no longer fits. CloudWatch metrics such as `CacheHitRate` and `Evictions` provide immediate visibility into these conditions without requiring direct Redis access. This aligns with the AWS Well-Architected Framework's principle of observability before making configuration changes.
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.
✗
Run the Redis INFO command to see memory usage
Why it's wrong here
Memory usage may be relevant, but cache hit ratio is the primary metric.
✗
Review the ElastiCache event logs for node failures
Why it's wrong here
Node failures would cause complete cache misses, not just reduced hit ratio.
✓
Check the CacheHitRate and Evictions metrics in CloudWatch
Why this is correct
These metrics directly indicate cache effectiveness.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Check the Redis AOF persistence logs
Why it's wrong here
Persistence logs are for durability, not cache performance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the first step should be a low-level Redis command (INFO) or logs, but AWS best practice emphasizes using CloudWatch metrics for initial investigation because they provide aggregated, historical data without requiring direct access to the cluster.
Detailed technical explanation
How to think about this question
Under the hood, ElastiCache for Redis uses the `maxmemory-policy` setting to determine eviction behavior (e.g., allkeys-lru, volatile-ttl). When evictions spike, the `Evictions` CloudWatch metric increases, and the `CacheHitRate` drops because frequently accessed keys are being removed. In a real-world scenario, a sudden traffic surge or a misconfigured TTL (time-to-live) on cached queries can cause the working set to exceed `maxmemory`, triggering evictions and degrading hit ratio—this is immediately visible in CloudWatch without needing to SSH into the cluster.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Check the CacheHitRate and Evictions metrics in CloudWatch — When the cache hit ratio drops significantly, the first step is to investigate whether the cache is evicting keys due to memory pressure or if the working set no longer fits. CloudWatch metrics such as `CacheHitRate` and `Evictions` provide immediate visibility into these conditions without requiring direct Redis access. This aligns with the AWS Well-Architected Framework's principle of observability before making configuration changes.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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