- A
Use S3 to store session state
Why wrong: S3 is not designed for low-latency session access.
- B
Use an ElastiCache Memcached cluster
Memcached is designed for session storage and is cost-effective.
- C
Use an RDS database to store session state
Why wrong: RDS is overkill and slower than in-memory cache.
- D
Store session state in the local file system of each EC2 instance
Why wrong: Not scalable; sessions are lost if instance terminates.
Question 1,577 of 1,616
Most Cost-Effective and Scalable Session State Storage for Elastic Beanstalk
This DVA-C02 practice question tests your understanding of development with aws services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 using AWS Elastic Beanstalk to deploy a web application. The application needs to store session state. Which configuration is MOST cost-effective and scalable?
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
✓
Use an ElastiCache Memcached cluster
ElastiCache Memcached is the most cost-effective and scalable solution for storing session state because it is an in-memory cache designed for low-latency access, which is ideal for session data that must be frequently read and written. It scales horizontally by adding nodes, and its distributed nature ensures that session data persists across EC2 instance replacements, unlike local storage. This avoids the higher cost and overhead of RDS or the latency and eventual consistency issues of S3 for session management.
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.
- ✗
Use S3 to store session state
Why it's wrong here
S3 is not designed for low-latency session access.
- ✓
Use an ElastiCache Memcached cluster
Why this is correct
Memcached is designed for session storage and is cost-effective.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use an RDS database to store session state
Why it's wrong here
RDS is overkill and slower than in-memory cache.
- ✗
Store session state in the local file system of each EC2 instance
Why it's wrong here
Not scalable; sessions are lost if instance terminates.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose local file system storage (D) because it seems simplest and free, overlooking that it fails in auto-scaling environments where instances are ephemeral and session data is not shared.
Detailed technical explanation
How to think about this question
Memcached distributes session data across a cluster using consistent hashing, which allows adding or removing nodes with minimal disruption. Under the hood, it uses a simple key-value store with no persistence, so session data is ephemeral—this is acceptable because sessions are temporary and can be regenerated if a node fails, making it ideal for cost-sensitive, scalable architectures. In a real-world scenario, you would configure the application (e.g., using PHP session handlers or Java Servlet filters) to point to the Memcached endpoint, ensuring seamless session sharing across all EC2 instances.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
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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: Use an ElastiCache Memcached cluster — ElastiCache Memcached is the most cost-effective and scalable solution for storing session state because it is an in-memory cache designed for low-latency access, which is ideal for session data that must be frequently read and written. It scales horizontally by adding nodes, and its distributed nature ensures that session data persists across EC2 instance replacements, unlike local storage. This avoids the higher cost and overhead of RDS or the latency and eventual consistency issues of S3 for session management.
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.
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 →
Same concept, more angles
2 more ways this is tested on DVA-C02
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 developer is deploying a web application using AWS Elastic Beanstalk. The application needs to store session state. The developer wants to ensure that session data is not lost if an EC2 instance is terminated. Which solution should the developer implement?
medium- A.Store session data in an Amazon EBS volume.
- B.Store session data in an Amazon S3 bucket.
- C.Store session data in the instance store.
- ✓ D.Store session data in an Amazon ElastiCache cluster.
Why D: Option D is correct because Amazon ElastiCache provides a managed, highly available, and durable in-memory cache that can store session state externally from EC2 instances. By using ElastiCache (e.g., Redis with replication and persistence), session data survives instance termination because it is stored in a separate, resilient service, not on the local instance.
Variation 2. A developer is deploying a web application using AWS Elastic Beanstalk. The application needs to store session state. Which THREE services can be used for session state storage? (Choose THREE.)
medium- ✓ A.Amazon ElastiCache for Redis
- ✓ B.Amazon DynamoDB
- C.Amazon S3
- D.Amazon CloudFront
- ✓ E.Amazon RDS
Why A: Amazon ElastiCache for Redis is correct because it provides a high-performance, in-memory data store that can be used to store session state externally from the web application. By using Redis, session data is stored outside of the Elastic Beanstalk EC2 instances, allowing the application to scale horizontally without losing session information. Redis supports data persistence and replication, making it a reliable choice for session management in distributed environments.
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Last reviewed: Jul 4, 2026
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