Quick Answer
The answer is Amazon CloudWatch Logs Insights. This is the correct choice because it provides a purpose-built, interactive query engine for analyzing log data directly within CloudWatch Logs, allowing you to run SQL-like queries to filter, aggregate, and visualize log events. When troubleshooting latency on ECS with Fargate, you can use its query language to pinpoint slow API calls, database queries, or error spikes by searching for patterns like high duration or response times across your container logs. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of operational troubleshooting tools; a common trap is choosing Amazon Athena or AWS X-Ray, but remember that CloudWatch Logs Insights is specifically for querying log data already in CloudWatch without needing to export it. For a memory tip, think of it as “SQL for your logs” — if you need to search, filter, or aggregate log events to find latency, CloudWatch Logs Insights is your go-to tool.
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An application running on Amazon ECS with Fargate is experiencing high latency. The application writes logs to Amazon CloudWatch Logs. Which AWS service can be used to analyze the logs to pinpoint the cause of the latency?
Amazon CloudWatch Logs
Why wrong: CloudWatch Logs only stores logs; it does not analyze them.
Amazon CloudWatch Logs Insights
Logs Insights allows querying and analyzing logs to identify latency causes.
AWS X-Ray
Why wrong: X-Ray traces requests but does not analyze logs.
Amazon S3
Why wrong: S3 is for storage, not analysis.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon CloudWatch Logs Insights
Amazon CloudWatch Logs Insights is the correct choice because it is purpose-built for interactively querying and analyzing log data stored in CloudWatch Logs. It allows you to run SQL-like queries (using a query language) to filter, aggregate, and visualize log events, which is essential for pinpointing latency patterns, such as slow API calls or database queries, without needing to export logs to another service.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Amazon CloudWatch Logs
Why it's wrong here
CloudWatch Logs only stores logs; it does not analyze them.
Amazon CloudWatch Logs Insights
Why this is correct
Logs Insights allows querying and analyzing logs to identify latency causes.
Related concept
Read the scenario before looking for a memorised answer.
AWS X-Ray
Why it's wrong here
X-Ray traces requests but does not analyze logs.
Amazon S3
Why it's wrong here
S3 is for storage, not analysis.
Common exam traps
The trap here is that candidates confuse CloudWatch Logs (storage/monitoring) with CloudWatch Logs Insights (query/analysis), assuming the former can perform deep log analysis, when in fact it only supports basic metric filters and real-time monitoring.
Detailed technical explanation
CloudWatch Logs Insights uses a purpose-built query language that supports operations like `stats`, `filter`, `sort`, and `parse` to extract fields from structured or unstructured logs. Under the hood, it indexes log data automatically and runs queries against a time-series backend, allowing you to calculate percentiles (e.g., `stats pct(latency, 95)`) to identify latency outliers. In a real-world scenario, you could query for `fields @timestamp, @message | filter @message like /ERROR/ | stats count() by @logStream` to isolate which task is causing delays.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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FAQ
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon CloudWatch Logs Insights — Amazon CloudWatch Logs Insights is the correct choice because it is purpose-built for interactively querying and analyzing log data stored in CloudWatch Logs. It allows you to run SQL-like queries (using a query language) to filter, aggregate, and visualize log events, which is essential for pinpointing latency patterns, such as slow API calls or database queries, without needing to export logs to another service.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DVA-C02 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 DVA-C02 exam.
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