- A
Stop the EC2 instances outside business hours and start them on a schedule.
Scheduled stop and start removes idle compute spend from nights and weekends while preserving the same application architecture.
- B
Replace the database with Aurora Serverless v2 so capacity can scale down during idle periods.
Aurora Serverless v2 is well suited to variable or partially idle database workloads because it scales capacity more flexibly.
- C
Move the app to larger EC2 instances so fewer machines are managed.
Why wrong: Larger instances usually increase cost and do not solve the core problem of paying for resources that sit unused.
- D
Keep RDS and EC2 running all weekend because start/stop is operationally risky.
Why wrong: The scenario explicitly allows a short startup delay, so leaving everything on defeats the main cost-saving opportunity.
- E
Use Spot Instances for the database tier.
Why wrong: Spot is unsuitable for a database because interruption can cause availability and data consistency issues.
Quick Answer
The answer is to schedule EC2 stop/start and replace the RDS database with Aurora Serverless v2. Stopping EC2 instances outside of office hours eliminates compute costs while retaining EBS volumes, and Aurora Serverless v2 automatically scales down to zero capacity during idle periods, charging only for consumed ACUs rather than provisioned instances. This combination directly addresses cost optimization for dev environment EC2 and RDS by aligning resource usage with actual demand, and the tolerated startup delay makes both actions viable. On the SAA-C03 exam, this scenario tests your understanding of lifecycle management for compute and database services, often appearing as a paired-choice question where a common trap is selecting RDS stop/start instead of Aurora Serverless—remember that standard RDS charges for storage even when stopped, while Aurora Serverless v2 truly pauses billing. Memory tip: “Stop the compute, serverless the database” to pair EC2 scheduling with Aurora’s auto-scaling.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure 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.
A development environment runs a small web app on EC2 and an Amazon RDS database, but it is used only on weekdays during office hours. The team wants to minimize spend and can tolerate a short startup delay after the environment is started. Which two changes should the architect recommend? Select two.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Stop the EC2 instances outside business hours and start them on a schedule.
Option A is correct because stopping EC2 instances outside business hours eliminates compute costs (you are not charged for stopped instances, only for attached EBS volumes). The team tolerates a short startup delay, so a scheduled stop/start (e.g., via AWS Instance Scheduler or Lambda) directly reduces spend without architectural changes.
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.
- ✓
Stop the EC2 instances outside business hours and start them on a schedule.
Why this is correct
Scheduled stop and start removes idle compute spend from nights and weekends while preserving the same application architecture.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Replace the database with Aurora Serverless v2 so capacity can scale down during idle periods.
Why this is correct
Aurora Serverless v2 is well suited to variable or partially idle database workloads because it scales capacity more flexibly.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Move the app to larger EC2 instances so fewer machines are managed.
Why it's wrong here
Larger instances usually increase cost and do not solve the core problem of paying for resources that sit unused.
- ✗
Keep RDS and EC2 running all weekend because start/stop is operationally risky.
Why it's wrong here
The scenario explicitly allows a short startup delay, so leaving everything on defeats the main cost-saving opportunity.
- ✗
Use Spot Instances for the database tier.
Why it's wrong here
Spot is unsuitable for a database because interruption can cause availability and data consistency issues.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think Aurora Serverless v2 is always cheaper than stopping a traditional RDS instance, but they overlook that Serverless v2 still has a minimum ACU charge and storage costs, while stopping an RDS instance eliminates compute cost entirely (only storage and backups are billed).
Trap categories for this question
Scenario analysis trap
The scenario explicitly allows a short startup delay, so leaving everything on defeats the main cost-saving opportunity.
Detailed technical explanation
How to think about this question
Stopping an EC2 instance transitions it to the 'stopped' state, where you are billed only for provisioned EBS storage (not instance hours). When you stop and start an RDS instance, the instance is billed only for storage and backups during the stopped period, but you must manually stop/start it (or use a scheduler) because RDS does not natively support scheduled stop/start. Aurora Serverless v2 (Option B) automatically scales capacity down to near zero during idle periods, but it still incurs a minimum capacity charge (0.5 ACU) and storage costs, making it a cost-effective alternative to a traditional RDS instance for intermittent workloads.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Stop the EC2 instances outside business hours and start them on a schedule. — Option A is correct because stopping EC2 instances outside business hours eliminates compute costs (you are not charged for stopped instances, only for attached EBS volumes). The team tolerates a short startup delay, so a scheduled stop/start (e.g., via AWS Instance Scheduler or Lambda) directly reduces spend without architectural changes.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.
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