- A
Amazon DynamoDB
DynamoDB is a low-latency NoSQL database suitable for session state.
- B
Amazon ElastiCache for Redis
Redis is commonly used for session state storage.
- C
Amazon S3
Why wrong: S3 is object storage with higher latency; not ideal for session state.
- D
Amazon EFS
Why wrong: EFS is a file system; not designed for session state storage.
- E
Amazon RDS for MySQL
Why wrong: RDS can store session data but is less efficient than Redis or DynamoDB for this use case.
Question 1,304 of 1,616
Best AWS Services for Session State Storage in Microservices
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer is designing a microservices architecture using Amazon ECS with Fargate. The application needs to store and retrieve user session data. Which TWO AWS services can be used to store session state?
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 DynamoDB
Amazon DynamoDB is a fully managed NoSQL key-value and document database that provides single-digit millisecond latency at any scale, making it ideal for storing session state in a microservices architecture. Its support for Time to Live (TTL) allows automatic expiration of session data, and its seamless integration with AWS Lambda and ECS Fargate enables stateless application design without managing servers.
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 this is correct
DynamoDB is a low-latency NoSQL database suitable for session state.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Amazon ElastiCache for Redis
Why this is correct
Redis is commonly used for session state storage.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3
Why it's wrong here
S3 is object storage with higher latency; not ideal for session state.
- ✗
Amazon EFS
Why it's wrong here
EFS is a file system; not designed for session state storage.
- ✗
Amazon RDS for MySQL
Why it's wrong here
RDS can store session data but is less efficient than Redis or DynamoDB for this use case.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume any database (like RDS) or any storage service (like S3) can handle session state, but the exam tests the specific requirement for low-latency, high-throughput, and stateless-friendly services like DynamoDB or ElastiCache, not relational or file-based storage.
Detailed technical explanation
How to think about this question
Under the hood, DynamoDB uses SSD-backed storage and a distributed hash table to achieve consistent single-digit millisecond latency, while its adaptive capacity automatically scales partitions to handle traffic spikes. For session state, DynamoDB's conditional writes and atomic counters can prevent race conditions in concurrent session updates, and its TTL feature uses a background process to delete expired items without consuming write capacity. In contrast, ElastiCache for Redis stores session data entirely in memory, offering sub-millisecond latency and advanced data structures like hashes for session attributes, but requires careful planning for data persistence and eviction policies under memory pressure.
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.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon DynamoDB — Amazon DynamoDB is a fully managed NoSQL key-value and document database that provides single-digit millisecond latency at any scale, making it ideal for storing session state in a microservices architecture. Its support for Time to Live (TTL) allows automatic expiration of session data, and its seamless integration with AWS Lambda and ECS Fargate enables stateless application design without managing servers.
What should I do if I get this DVA-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
This DVA-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 DVA-C02 exam.
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