- A
Deploy the job on EC2 instances and keep them running continuously for the daily schedule.
Why wrong: Always-on EC2 instances increase cost and do not minimize operational overhead for short-lived jobs.
- B
Use AWS Lambda triggered by a schedule (for example, EventBridge) to run the report at the required time.
Lambda runs on demand and charges for execution time, aligning spend with actual job runtime and reducing ops.
- C
Run the job in an RDS database using stored procedures scheduled by the database engine.
Why wrong: RDS is not designed for general scheduled compute workloads like daily report generation.
- D
Use an Auto Scaling group with a fixed minimum size of one instance and disable scaling.
Why wrong: A fixed-size Auto Scaling group still requires instance management and does not fully match runtime-based billing.
Quick Answer
The answer is AWS Lambda triggered by a schedule via Amazon EventBridge. This is the correct choice because Lambda is purpose-built for short-running, infrequent tasks like a daily report that finishes in under 15 minutes, as it eliminates idle server costs by running only when invoked and charges solely for compute time used. On the SAA-C03 exam, this scenario tests your ability to match workload characteristics—specifically, a predictable, short-duration job—to the appropriate serverless compute service, with a common trap being to suggest Amazon ECS or a small EC2 instance, which would incur costs even when idle. Remember that any job completing within Lambda’s 15-minute maximum execution timeout is a strong candidate for scheduled Lambda, especially when operational overhead reduction is a priority. Memory tip: think “Lambda for the short sprint, not the marathon”—if it finishes in minutes, Lambda wins.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. 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 internal team runs a report-generation job once per day. It typically finishes in a few minutes, and even on its slowest days it still completes in under 15 minutes. The team wants to reduce operational overhead and pay primarily for actual runtime instead of keeping servers running 24/7. Which AWS approach best matches these goals?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use AWS Lambda triggered by a schedule (for example, EventBridge) to run the report at the required time.
AWS Lambda, triggered by Amazon EventBridge (CloudWatch Events), is ideal for short-lived, infrequent jobs like this daily report. It eliminates idle server costs by running only when invoked, and the 15-minute execution timeout comfortably covers the job's maximum runtime. This serverless approach directly reduces operational overhead and aligns with a pay-per-use cost model.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploy the job on EC2 instances and keep them running continuously for the daily schedule.
Why it's wrong here
Always-on EC2 instances increase cost and do not minimize operational overhead for short-lived jobs.
- ✓
Use AWS Lambda triggered by a schedule (for example, EventBridge) to run the report at the required time.
Why this is correct
Lambda runs on demand and charges for execution time, aligning spend with actual job runtime and reducing ops.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Run the job in an RDS database using stored procedures scheduled by the database engine.
Why it's wrong here
RDS is not designed for general scheduled compute workloads like daily report generation.
- ✗
Use an Auto Scaling group with a fixed minimum size of one instance and disable scaling.
Why it's wrong here
A fixed-size Auto Scaling group still requires instance management and does not fully match runtime-based billing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume EC2 or Auto Scaling is needed for any scheduled job, overlooking that Lambda's 15-minute timeout and serverless pricing perfectly suit short, infrequent tasks, while the 'pay primarily for actual runtime' requirement explicitly points away from always-on compute.
Detailed technical explanation
How to think about this question
Lambda functions have a maximum execution timeout of 15 minutes (900 seconds), which matches the job's worst-case runtime. Under the hood, Lambda uses Firecracker microVMs for isolation, and EventBridge cron expressions (e.g., 'cron(0 2 * * ? *)') trigger the function once daily. In a real-world scenario, if the job needed more than 15 minutes, you would consider AWS Fargate or Batch instead, but here the timeout is sufficient.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS Lambda triggered by a schedule (for example, EventBridge) to run the report at the required time. — AWS Lambda, triggered by Amazon EventBridge (CloudWatch Events), is ideal for short-lived, infrequent jobs like this daily report. It eliminates idle server costs by running only when invoked, and the 15-minute execution timeout comfortably covers the job's maximum runtime. This serverless approach directly reduces operational overhead and aligns with a pay-per-use cost model.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Same concept, more angles
1 more ways this is tested on SAA-C03
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An internal team runs a report-generation job once per day. It typically finishes in a few minutes, and even on its slowest days it still completes in under 15 minutes. The team wants to reduce operational overhead and pay primarily for actual runtime instead of keeping servers running 24/7. Which AWS approach best matches these goals?
easy- A.Deploy the job on EC2 instances and keep them running continuously for the daily schedule.
- ✓ B.Use AWS Lambda triggered by a schedule (for example, EventBridge) to run the report at the required time.
- C.Run the job in an RDS database using stored procedures scheduled by the database engine.
- D.Use an Auto Scaling group with a fixed minimum size of one instance and disable scaling.
Why B: AWS Lambda is the ideal choice because it is a serverless compute service that runs code only when triggered, aligning with the requirement to pay primarily for actual runtime. By using Amazon EventBridge (CloudWatch Events) to invoke the Lambda function on a daily schedule, the team eliminates the need to provision or manage servers, and the job's typical runtime of a few minutes (under 15 minutes, Lambda's maximum execution timeout) fits perfectly within Lambda's constraints.
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Last reviewed: Jun 11, 2026
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