- A
Store session state in Amazon DynamoDB.
Why wrong: DynamoDB is durable and suitable, but for session state that can be lost, ElastiCache is more cost-effective and lower latency.
- B
Store session state in Amazon S3.
Why wrong: S3 has higher latency and is not ideal for frequent access session state.
- C
Store session state in Amazon ElastiCache for Redis.
ElastiCache for Redis provides ultra-low latency in-memory storage, ideal for session state that can be recreated.
- D
Store session state in Amazon EFS.
Why wrong: EFS is for file storage and has higher latency than in-memory.
Question 1,346 of 1,746
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 deploying a containerized application on Amazon ECS with Fargate. The application needs to store session state data that must be highly available and low latency. The data is accessed frequently and can be recreated if lost. Which storage solution should the solutions architect recommend?
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
✓
Store session state in Amazon ElastiCache for Redis.
Amazon ElastiCache for Redis is the ideal choice for storing session state data in a containerized ECS with Fargate environment because it provides in-memory caching with sub-millisecond latency, high availability through replication and automatic failover, and supports data persistence. Since the session data can be recreated if lost, the ephemeral nature of Redis is acceptable, and its low-latency access pattern perfectly matches the frequent read/write requirements of session state.
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.
- ✗
Store session state in Amazon DynamoDB.
Why it's wrong here
DynamoDB is durable and suitable, but for session state that can be lost, ElastiCache is more cost-effective and lower latency.
- ✗
Store session state in Amazon S3.
Why it's wrong here
S3 has higher latency and is not ideal for frequent access session state.
- ✓
Store session state in Amazon ElastiCache for Redis.
Why this is correct
ElastiCache for Redis provides ultra-low latency in-memory storage, ideal for session state that can be recreated.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Store session state in Amazon EFS.
Why it's wrong here
EFS is for file storage and has higher latency than in-memory.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Amazon DynamoDB (Option A) because it is a fully managed, highly available NoSQL database, but they overlook the specific requirement for 'low latency' and 'frequently accessed' data, which in-memory caching like Redis is designed to satisfy, not a disk-based database like DynamoDB.
Detailed technical explanation
How to think about this question
ElastiCache for Redis uses an in-memory data structure store with optional persistence via snapshots (RDB) or append-only files (AOF), allowing session data to be recreated quickly if lost. Under the hood, Redis supports data structures like hashes and sorted sets, which are ideal for session management with TTL (time-to-live) keys for automatic expiration, and its replication across multiple Availability Zones ensures high availability with automatic failover in under 10 seconds. In a real-world scenario, a high-traffic e-commerce site using ECS Fargate would benefit from Redis's ability to handle millions of session operations per second with consistent single-digit millisecond latency, while DynamoDB would struggle with the same throughput due to its provisioned capacity limits and higher read/write costs.
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 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.
What to study next
Got this wrong? Here's your next step.
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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: Store session state in Amazon ElastiCache for Redis. — Amazon ElastiCache for Redis is the ideal choice for storing session state data in a containerized ECS with Fargate environment because it provides in-memory caching with sub-millisecond latency, high availability through replication and automatic failover, and supports data persistence. Since the session data can be recreated if lost, the ephemeral nature of Redis is acceptable, and its low-latency access pattern perfectly matches the frequent read/write requirements of session state.
What should I do if I get this SAP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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