- A
Amazon DynamoDB
Why wrong: Amazon DynamoDB provides low-latency performance but is not as fast as an in-memory cache like ElastiCache. It is better suited for persistent data storage rather than transient session data.
- B
Amazon S3
Why wrong: Amazon S3 is an object storage service with higher latency and not designed for frequent small reads/writes required for session data.
- C
Amazon RDS for MySQL
Why wrong: Amazon RDS for MySQL is a relational database with higher latency compared to in-memory solutions, making it less optimal for high-throughput session storage.
- D
Amazon ElastiCache for Redis
Amazon ElastiCache for Redis is an in-memory key-value store that provides sub-millisecond latency, making it the best choice for storing user session data for up to 10 million active users.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. 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 company is designing a new application that will run on AWS. The application needs to store and retrieve user session data with low latency. The session data is small (less than 1 KB per user) and must be highly available. The company expects up to 10 million active users per day. Which AWS service should be used as the session store?
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
Amazon ElastiCache for Redis
Option D is correct because Amazon ElastiCache for Redis is an in-memory data store designed for low-latency access, making it ideal for session storage for millions of users. Option A: DynamoDB has higher latency compared to in-memory stores. Option B: S3 is object storage and not suitable for low-latency session data. Option C: RDS for MySQL is relational and slower for session access.
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.
- ✗
Amazon DynamoDB
Why it's wrong here
Amazon DynamoDB provides low-latency performance but is not as fast as an in-memory cache like ElastiCache. It is better suited for persistent data storage rather than transient session data.
- ✗
Amazon S3
Why it's wrong here
Amazon S3 is an object storage service with higher latency and not designed for frequent small reads/writes required for session data.
- ✗
Amazon RDS for MySQL
Why it's wrong here
Amazon RDS for MySQL is a relational database with higher latency compared to in-memory solutions, making it less optimal for high-throughput session storage.
- ✓
Amazon ElastiCache for Redis
Why this is correct
Amazon ElastiCache for Redis is an in-memory key-value store that provides sub-millisecond latency, making it the best choice for storing user session data for up to 10 million active users.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Design for New Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon ElastiCache for Redis — Option D is correct because Amazon ElastiCache for Redis is an in-memory data store designed for low-latency access, making it ideal for session storage for millions of users. Option A: DynamoDB has higher latency compared to in-memory stores. Option B: S3 is object storage and not suitable for low-latency session data. Option C: RDS for MySQL is relational and slower for session access.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 20, 2026
This SAP-C02 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 SAP-C02 exam.
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