The answer is to use Amazon CloudWatch Agent to collect custom metrics from each Aurora instance and aggregate them in CloudWatch. This approach is correct because CloudWatch Agent can gather operating system and database-level metrics directly from each Aurora MySQL instance, then publish them to a centralized CloudWatch namespace for unified monitoring across all tenant databases. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of cost-effective, low-overhead monitoring for multi-tenant architectures—specifically that CloudWatch Agent avoids the performance hit of a Lambda function querying each database or the isolation risks of a single RDS instance. A common trap is choosing AWS DMS for monitoring, but DMS is strictly for data migration, not metric collection. Remember the memory tip: “Agent aggregates, Lambda lags”—CloudWatch Agent runs as a lightweight daemon on each instance, while Lambda adds latency and cost per invocation.
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 Aurora MySQL for a SaaS application. Each tenant has a separate database. The company wants to implement a centralized monitoring solution that collects performance metrics from all tenant databases. The solution should be cost-effective and require minimal overhead. Which approach should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Amazon CloudWatch Agent to collect custom metrics from each Aurora instance and aggregate in CloudWatch.
Option C is correct because Amazon CloudWatch Agent installed on each Aurora instance can collect custom metrics, but more efficiently, Aurora publishes Performance Insights metrics to CloudWatch. Option A is wrong because a single RDS instance cannot host multiple databases for isolation. Option B is wrong because DMS is for data migration, not monitoring. Option D is wrong because a Lambda function querying each database would create overhead.
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.
✗
Use AWS DMS to continuously replicate metrics to a central RDS instance.
Why it's wrong here
DMS is not for monitoring.
✗
Consolidate all tenants into a single RDS MySQL instance and use separate schemas.
Why it's wrong here
Loss of tenant isolation.
✗
Run an AWS Lambda function that queries each database's performance_schema every minute and stores results in S3.
Why it's wrong here
Lambda queries add overhead and cost.
✓
Use Amazon CloudWatch Agent to collect custom metrics from each Aurora instance and aggregate in CloudWatch.
Why this is correct
CloudWatch Agent collects metrics with low overhead.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Amazon CloudWatch Agent to collect custom metrics from each Aurora instance and aggregate in CloudWatch. — Option C is correct because Amazon CloudWatch Agent installed on each Aurora instance can collect custom metrics, but more efficiently, Aurora publishes Performance Insights metrics to CloudWatch. Option A is wrong because a single RDS instance cannot host multiple databases for isolation. Option B is wrong because DMS is for data migration, not monitoring. Option D is wrong because a Lambda function querying each database would create overhead.
What should I do if I get this DBS-C01 question wrong?
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.
Question Discussion
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