The correct choice is to store session data in Amazon ElastiCache for Redis. This strategy decouples session state from local memory, allowing containerized applications on Amazon ECS to scale horizontally without losing user context, while also providing fault tolerance through replication and persistence. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of stateful versus stateless architectures in microservices migrations—a common trap is assuming DynamoDB is suitable for session caching, but its latency and cost profile make it a poor fit compared to Redis’s in-memory speed. The key insight is that local memory binds state to a single container, preventing elasticity; ElastiCache acts as a centralized, low-latency store that survives container restarts and scaling events. Memory tip: think “Stateless containers, stateful cache”—if the app needs to remember users, keep that memory in Redis, not in the container’s RAM.
SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
This SAP-C02 practice question tests your understanding of accelerate workload migration and modernization. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 migrating a monolithic application to Amazon ECS. The application currently stores session data in local memory. Which migration strategy should the company adopt to ensure scalability and fault tolerance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Store session data in Amazon ElastiCache for Redis.
C is correct because storing session data in Amazon ElastiCache decouples state from the container, enabling horizontal scaling and resilience. A is wrong because local memory prevents scaling. B is wrong because DynamoDB is a database, not a caching layer for session state. D is wrong because it does not solve the issue of session persistence across containers.
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 data in Amazon ElastiCache for Redis.
Why this is correct
ElastiCache provides a highly available, in-memory cache that containers can access independently.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Amazon S3 to store session data.
Why it's wrong here
S3 has higher latency and is not designed for frequent read/write session operations.
✗
Use sticky sessions (session affinity) on the Application Load Balancer.
Why it's wrong here
Sticky sessions tie a client to a specific container, which limits scaling and fault tolerance.
✗
Migrate session data to Amazon DynamoDB.
Why it's wrong here
DynamoDB is not optimized for session caching; ElastiCache is the recommended service.
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.
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.
Accelerate Workload Migration and Modernization — This question tests Accelerate Workload Migration and Modernization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Store session data in Amazon ElastiCache for Redis. — C is correct because storing session data in Amazon ElastiCache decouples state from the container, enabling horizontal scaling and resilience. A is wrong because local memory prevents scaling. B is wrong because DynamoDB is a database, not a caching layer for session state. D is wrong because it does not solve the issue of session persistence across containers.
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 →
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. A company is migrating a web application to AWS and wants to use Amazon ECS with Fargate. The application needs to store session state. Which AWS service should the company use for session state management?
medium
✓ A.Amazon ElastiCache for Redis
B.Amazon S3
C.Amazon DynamoDB
D.Amazon RDS
Why A: Option B is correct because Amazon ElastiCache for Redis is commonly used for session state management in containerized applications. Option A is wrong because Amazon DynamoDB can also be used, but ElastiCache is more commonly recommended for session state. Option C is wrong because Amazon S3 is not suitable for low-latency session state. Option D is wrong because Amazon RDS is for relational databases, not session state.
Last reviewed: Jun 20, 2026
Question Discussion
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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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