- A
Amazon DynamoDB
DynamoDB offers single-digit millisecond latency and is fully managed.
- B
Amazon S3
Why wrong: S3 has higher latency and is not suitable for real-time session access.
- C
Amazon EFS
Why wrong: EFS is a file system, not designed for low-latency key-value access.
- D
Amazon ElastiCache for Redis
Redis provides in-memory caching with sub-millisecond latency, ideal for session data.
- E
Amazon RDS for PostgreSQL
Why wrong: RDS is a relational database with higher latency for session data.
Question 1,604 of 1,616
ECS Fargate Session Storage Options: DynamoDB vs ElastiCache for Low-Latency Session Data
This DVA-C02 practice question tests your understanding of development with aws services. 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 has a web application running on Amazon ECS with Fargate launch type. The application needs to store and retrieve user session data. The sessions are small and require very low latency access. The development team wants a fully managed solution. Which storage options meet these requirements? (Choose TWO.)
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 correct because it is a fully managed NoSQL key-value database that provides single-digit millisecond latency for read and write operations, making it ideal for storing small session data with low latency requirements. It scales automatically and requires no server management, aligning with the fully managed requirement and the Fargate launch type's serverless nature.
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 offers single-digit millisecond latency and is fully managed.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3
Why it's wrong here
S3 has higher latency and is not suitable for real-time session access.
- ✗
Amazon EFS
Why it's wrong here
EFS is a file system, not designed for low-latency key-value access.
- ✓
Amazon ElastiCache for Redis
Why this is correct
Redis provides in-memory caching with sub-millisecond latency, ideal for session data.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon RDS for PostgreSQL
Why it's wrong here
RDS is a relational database with higher latency for session data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Amazon S3 for its simplicity and low cost, overlooking its higher latency and lack of support for low-latency session storage, or they mistakenly think EFS can be mounted directly to Fargate tasks without understanding the integration limitations.
Detailed technical explanation
How to think about this question
DynamoDB achieves low latency through its distributed architecture and SSD-backed storage, with consistent performance even under high throughput via auto-scaling and on-demand capacity modes. ElastiCache for Redis stores session data in-memory, providing microsecond latency, and supports features like TTL (time-to-live) for automatic session expiration, which is critical for session management. Under the hood, Redis uses a single-threaded event loop for atomic operations, ensuring predictable performance for small payloads like session tokens.
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 correct because it is a fully managed NoSQL key-value database that provides single-digit millisecond latency for read and write operations, making it ideal for storing small session data with low latency requirements. It scales automatically and requires no server management, aligning with the fully managed requirement and the Fargate launch type's serverless nature.
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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