- A
Amazon RDS for MySQL
Why wrong: Amazon RDS is a managed relational database service, but it requires managing database instances, does not automatically scale throughput, and is not designed for unpredictable, high-traffic key-value workloads like session data. It is better suited for traditional relational workloads.
- B
Amazon DynamoDB
Amazon DynamoDB is a fully managed NoSQL database that provides single-digit millisecond performance at any scale. It supports on-demand capacity mode, which automatically scales to accommodate traffic spikes and charges per request, eliminating the need for provisioning. It is ideal for session storage, gaming, and real-time applications.
- C
Amazon Redshift
Why wrong: Amazon Redshift is a petabyte-scale data warehouse used for analytical queries on large datasets. It is not optimized for low-latency, high-frequency point lookups or writes, and requires cluster management. It does not fit the use case of a session database.
- D
Amazon EBS
Why wrong: Amazon EBS provides block-level storage volumes for use with Amazon EC2 instances. It is not a database service and does not offer query capabilities, automatic scaling, or throughput-based pricing. It simply provides raw storage that must be managed by the operating system.
Quick Answer
The answer is Amazon DynamoDB, a fully managed NoSQL database with on-demand scaling that perfectly matches the requirements. DynamoDB’s on-demand capacity mode automatically adjusts to sudden traffic spikes without any provisioning, and its pay-per-request billing charges only for the reads and writes actually consumed, eliminating the need for capacity planning or server administration. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding of when to choose a NoSQL service over relational databases like RDS, and the key differentiator is unpredictable, low-latency workloads that demand automatic scaling without manual intervention. A common trap is selecting Amazon RDS or Aurora, but those require provisioning and are relational, not NoSQL. Remember the memory tip: “DynamoDB handles the dynamo—unpredictable spikes, no provisioning, pay as you go.”
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and 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 company is developing a mobile application that requires a database to store user session data and preferences. The data is accessed very frequently with low-latency requirements, and the access patterns are unpredictable – the application experiences sudden spikes in read and write traffic. The company wants a fully managed database service that automatically scales to handle the workload, requires no patching or server administration, and charges based on the throughput consumed rather than on provisioned capacity. Which AWS service meets these requirements?
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 delivers single-digit millisecond latency at any scale. It supports on-demand capacity mode, which automatically scales to handle unpredictable traffic spikes and charges based on the actual reads and writes consumed, not on pre-provisioned throughput. This eliminates the need for patching, server administration, or capacity planning, matching all the stated requirements exactly.
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 RDS for MySQL
Why it's wrong here
Amazon RDS is a managed relational database service, but it requires managing database instances, does not automatically scale throughput, and is not designed for unpredictable, high-traffic key-value workloads like session data. It is better suited for traditional relational workloads.
- ✓
Amazon DynamoDB
Why this is correct
Amazon DynamoDB is a fully managed NoSQL database that provides single-digit millisecond performance at any scale. It supports on-demand capacity mode, which automatically scales to accommodate traffic spikes and charges per request, eliminating the need for provisioning. It is ideal for session storage, gaming, and real-time applications.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon Redshift
Why it's wrong here
Amazon Redshift is a petabyte-scale data warehouse used for analytical queries on large datasets. It is not optimized for low-latency, high-frequency point lookups or writes, and requires cluster management. It does not fit the use case of a session database.
- ✗
Amazon EBS
Why it's wrong here
Amazon EBS provides block-level storage volumes for use with Amazon EC2 instances. It is not a database service and does not offer query capabilities, automatic scaling, or throughput-based pricing. It simply provides raw storage that must be managed by the operating system.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'fully managed' with 'serverless' and pick Amazon RDS for MySQL because it is also fully managed, but they overlook the specific requirement for throughput-based pricing and automatic scaling for unpredictable spikes, which only DynamoDB's on-demand mode provides.
Detailed technical explanation
How to think about this question
DynamoDB's on-demand capacity mode uses a built-in adaptive capacity mechanism that instantly accommodates traffic bursts without throttling, as long as the workload stays within table-level throughput limits. Under the hood, DynamoDB automatically partitions data across multiple storage nodes and uses consistent hashing to distribute load, ensuring predictable low-latency performance even under unpredictable access patterns. A real-world scenario is a gaming leaderboard that sees massive write spikes during a tournament and then returns to low traffic, where DynamoDB's pay-per-request model avoids over-provisioning 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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and 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 delivers single-digit millisecond latency at any scale. It supports on-demand capacity mode, which automatically scales to handle unpredictable traffic spikes and charges based on the actual reads and writes consumed, not on pre-provisioned throughput. This eliminates the need for patching, server administration, or capacity planning, matching all the stated requirements exactly.
What should I do if I get this CLF-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: Jun 11, 2026
This CLF-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 CLF-C02 exam.
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