Rightsize Low-Usage EC2 Instances
A company has deployed a web application to Amazon EC2 instances. The EC2 instances have low usage. Which AWS service or feature should the company use to rightsize the EC2 instances?
Community Votes
100% of anonymous learners picked answer D. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
The question tests knowledge of AWS optimization tools, specifically distinguishing between cost anomaly detection and compute resource recommendation engines.
AWS Compute Optimizer is the recommended service to analyze historical utilization metrics and provide rightsizing recommendations for underutilized Amazon EC2 instances.
Learners often confuse AWS Cost Anomaly Detection with Compute Optimizer; the former detects unusual costs while the latter suggests instance type changes based on performance data.
Community Discussion (5 comments)
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Expert Analysis
Why the Answer Is Correct
AWS Compute Optimizer uses machine learning to analyze historical utilization metrics from Amazon EC2, Amazon RDS, AWS Lambda, and EBS volumes to generate rightsizing recommendations. For EC2 instances with low usage, it suggests smaller instance types or stopping unused instances, directly addressing the "rightsize" requirement in the scenario.Why the Other Options Are Wrong
AWS Config tracks resource configurations but does not provide performance-based rightsizing advice. AWS Budgets allows setting spending limits and alerts, which helps control costs but does not optimize infrastructure. AWS Cost Anomaly Detection identifies unexpected spikes in costs but does not offer actionable technical recommendations for instance sizing.Community Comment Notes
The community consensus strongly supports AWS Compute Optimizer as the correct answer. As Webcatman noted, the official AWS page confirms this capability. Other users like Nikmah highlighted its ability to tailor recommendations to workload requirements, reinforcing the tool's suitability for this specific use case.Official Reference
Exam Strategy
When a question asks to "rightsize" or optimize compute resources based on usage, immediately consider AWS Compute Optimizer. Distinguish it from cost management tools like Budgets or Cost Explorer, which focus on financial aspects rather than technical performance metrics.
Frequently Asked Questions
Can AWS Compute Optimizer recommend stopping instances?
Yes, if an instance has consistently low utilization over a period, Compute Optimizer may recommend stopping it to save costs.
Does AWS Config help with rightsizing?
No, AWS Config monitors compliance and configuration history but does not analyze performance metrics to suggest instance size changes.
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