Pricing Models, Purchasing Options and Rightsizing
This topic covers Savings Plans, Reserved Instances, Spot, On-Demand, Compute Optimizer, Trusted Advisor, Cost Explorer, Budgets, and workload commitment analysis.
How to study for AWS Solutions Architect Associate
Treat each question as an architecture tradeoff: identify security boundaries, failure modes, performance needs, data paths, and cost constraints before choosing services.
Core concepts
Concept 1
Pricing Models, Purchasing Options and Rightsizing questions reward architecture tradeoff reasoning rather than picking the most familiar AWS service.
Exam cue: Identify the workload requirement, failure mode, data path, access boundary, and operational constraint.
Concept 2
The best answer maps requirements to security, resilience, performance, and cost constraints before choosing services.
Exam cue: Match the AWS service to the Well-Architected pillar the scenario is testing.
Concept 3
Eliminate answers that ignore shared responsibility, single points of failure, data movement, scaling behavior, or total cost.
Exam cue: Prefer managed, durable, least-privilege, multi-AZ, and right-sized designs when requirements call for them.
Risk pitfalls and guardrails
Choosing the most powerful service when a simpler managed service satisfies the requirement.
Guardrail: Avoid answers that use broad permissions, public data paths, single-AZ state, overbuilt compute, or commitment pricing without predictable usage.
Solving performance while ignoring security, availability, or cost constraints stated in the scenario.
Guardrail: Avoid answers that use broad permissions, public data paths, single-AZ state, overbuilt compute, or commitment pricing without predictable usage.
Assuming one Availability Zone, public access, or manual operations are acceptable without justification.
Guardrail: Avoid answers that use broad permissions, public data paths, single-AZ state, overbuilt compute, or commitment pricing without predictable usage.
Memory anchors
Savings Plan
Savings Plans provide discounts in exchange for a consistent usage commitment.
Reserved Instance
Reserved Instances provide discounts for eligible steady-state instance usage commitments.
Spot
Spot capacity uses spare AWS capacity at discounts and can be interrupted.
Compute Optimizer
AWS Compute Optimizer recommends resource sizing improvements based on utilization.
Trusted Advisor
AWS Trusted Advisor provides checks for cost optimization, security, reliability, performance, and service limits.
Cost Explorer
AWS Cost Explorer analyzes historical cost and usage trends.
AWS Budgets
AWS Budgets tracks cost or usage against thresholds and sends alerts.
Steady State
Steady-state workloads are good candidates for commitment-based discounts.
Idle Resource
Idle resources can add cost without delivering workload value.
Commitment Risk
Commitment discounts should match predictable usage to avoid paying for unused capacity.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A company has steady compute spend but expects to move workloads among EC2 instance families and Regions and may migrate some services to Fargate or Lambda. Which commitment offers the needed flexibility?
A stable EC2 workload will remain in the same instance family and Region for three years, although instance sizes and operating systems may change. The company wants a larger discount than a Compute Savings Plan. Which option is best?
Answer all questions to submit.
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Move forward only after this module is stable.
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