Which Tool Rightsizes EC2 Instances From Usage Data?
Which AWS service or tool provides recommendations to help users get rightsized Amazon EC2 instances based on historical workload usage data?
Community Votes
100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
The question tests which AWS tool turns historical workload usage data into EC2 rightsizing advice; the trap is picking any cost- or operations-related tool such as AWS Pricing Calculator or AWS Systems Manager instead of the purpose-built service.
AWS Compute Optimizer analyzes historical configuration and utilization metrics for Amazon EC2 and other resources to deliver rightsizing recommendations that balance cost and performance. This page confirms that Compute Optimizer, not the pricing calculator, App Runner, or Systems Manager, is the tool built for data-driven instance rightsizing.
Option A (AWS Pricing Calculator) is the most common wrong pick because it sounds cost-related, but it only estimates the cost of new or restructured architectures and never inspects your existing EC2 utilization data.
Community Discussion (3 comments)
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Expert Analysis
Why the Answer Is Correct
AWS Compute Optimizer is the service that examines your resources' configuration settings and utilization metrics gathered over time, then reports whether each Amazon EC2 instance is over-provisioned, under-provisioned, or optimal. It generates rightsizing recommendations based on historical workload usage data, aiming to reduce cost while preserving or improving performance, which is exactly what the question describes. Its outputs include recommended instance types plus graphs of recent utilization history so you can validate the suggestion before acting.Why the Other Options Are Wrong
AWS Pricing Calculator (A) lets you model the estimated cost of a proposed AWS environment before deployment; it has no access to your live workload telemetry and cannot produce rightsizing advice. AWS App Runner (C) is a service for running containerized web applications and APIs quickly, unrelated to EC2 capacity analysis. AWS Systems Manager (D) is an operations suite for patching, automation, and session management; its tools such as Inventory and Explorer support operations, but the usage-based rightsizing recommendation function described here belongs to Compute Optimizer.Community Comment Notes
Comments unanimously back option B, with a77c459 quoting AWS's own definition that Compute Optimizer "analyzes your AWS resources' configuration and utilization metrics to provide you with rightsizing recommendations." alokdixit2006 repeats the same vendor wording and notes it reports whether resources are optimal, while d00b229 simply confirms "B. AWS Compute Optimizer." No dissenting view appeared, and the consensus aligns with AWS documentation.Official Reference
Exam Strategy
When a question mentions analyzing historical usage or utilization data to recommend changes, look for the AWS service whose name implies optimization of compute; Pricing Calculator only estimates future cost, and Systems Manager covers operations tasks.
Frequently Asked Questions
Why is AWS Pricing Calculator not the rightsizing tool for EC2?
The Pricing Calculator only estimates costs for a proposed architecture you design; it does not read your existing EC2 utilization metrics or generate instance rightsizing recommendations.
How does AWS Compute Optimizer differ from AWS Systems Manager?
Compute Optimizer analyzes utilization history to recommend optimal instance types, while Systems Manager handles operations tasks such as patching, automation, and session management.
Related Analysis
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