SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: provisioned Concurrency keeps Lambda execution environments pre-initialized.. 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 Lambda-based retail API has unpredictable traffic spikes and users see latency caused by cold starts. The function must respond consistently during expected campaign windows. What should be configured? The architecture review board prefers a managed AWS-native control.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Provisioned concurrency during campaign windows
Provisioned concurrency pre-warms a specified number of Lambda execution environments, eliminating cold starts during the campaign windows. This is a managed AWS-native feature that ensures consistent sub-100ms response times even under unpredictable traffic spikes, directly addressing the latency issue.
CloudTrail records API activity and does not reduce Lambda latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse reserved concurrency (which only limits scaling) with provisioned concurrency (which pre-warms environments), leading them to pick option B as a cost-saving measure without realizing it does not solve cold starts.
Detailed technical explanation
How to think about this question
Provisioned concurrency works by keeping a configurable number of execution environments initialized and ready to serve requests immediately, bypassing the cold start phase that typically adds 200ms–1s of latency. Under the hood, AWS Lambda maintains these environments in a 'warm' state by periodically sending dummy invocations, and you are billed for the provisioned concurrency even when idle. This is ideal for campaign windows where traffic is predictable and latency-sensitive, but it is not cost-effective for constant low-traffic periods.
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.
Review provisioned Concurrency keeps Lambda execution environments pre-initialized., then practise related SAA-C03 questions on the same topic to reinforce the concept.
The correct answer is: Provisioned concurrency during campaign windows — Provisioned concurrency pre-warms a specified number of Lambda execution environments, eliminating cold starts during the campaign windows. This is a managed AWS-native feature that ensures consistent sub-100ms response times even under unpredictable traffic spikes, directly addressing the latency issue.
What should I do if I get this SAA-C03 question wrong?
Review provisioned Concurrency keeps Lambda execution environments pre-initialized., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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