- A
Amazon RDS for PostgreSQL
Why wrong: Amazon RDS is a relational database service that is not optimized for key-value access patterns. It scales primarily vertically (larger instances) and does not provide the same horizontal scalability and low-latency performance as a NoSQL database for this use case.
- B
Amazon Redshift
Why wrong: Amazon Redshift is a data warehouse service designed for analytical queries on large datasets. It is not suitable for real-time, low-latency key-value lookups and does not support the access patterns required for player profiles and session state.
- C
Amazon DynamoDB
Correct. Amazon DynamoDB is a fully managed NoSQL key-value and document database that provides single-digit millisecond latency at any scale. It scales horizontally, supports auto scaling, and offers built-in multi-AZ replication for high availability and durability.
- D
Amazon ElastiCache for Redis
Why wrong: Amazon ElastiCache is an in-memory caching service that provides low latency but is not designed as a durable primary datastore. While it can store session data, it lacks the persistence, durability guarantees, and managed scaling features that DynamoDB offers for a primary database.
Quick Answer
Amazon DynamoDB is the correct choice because it is a fully managed, serverless, NoSQL key-value database that delivers single-digit millisecond latency at any scale, making it the ideal low-latency key-value database on AWS. DynamoDB achieves this through automatic data partitioning and replication across multiple Availability Zones, enabling horizontal scaling without downtime while maintaining consistent performance even as traffic grows unpredictably. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding of which AWS service aligns with requirements for a fully managed, highly available key-value store with built-in multi-AZ replication—a common trap is confusing DynamoDB with Amazon RDS or ElastiCache, but remember that DynamoDB is serverless and scales automatically without provisioning. A helpful memory tip: think of DynamoDB as “Dynamo for Dynamic Data”—it handles unpredictable, high-velocity key-value workloads with low latency and zero downtime scaling.
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 gaming company operates a mobile game with millions of active users. The game stores player profiles and session state in a key-value database. The database must provide single-digit millisecond latency for read and write operations at any scale. The company expects traffic to grow unpredictably, and the database must scale horizontally without downtime. The company wants a fully managed, highly available solution with built-in replication across multiple Availability Zones. Which AWS service should the company use?
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 the correct choice because it is a fully managed, serverless, NoSQL key-value database that delivers single-digit millisecond latency at any scale. It supports horizontal scaling via automatic partitioning and replication across multiple Availability Zones (AZs) for high availability, with no downtime required for scaling. This directly matches the gaming company's requirements for low-latency reads/writes, unpredictable traffic growth, and built-in multi-AZ replication.
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 PostgreSQL
Why it's wrong here
Amazon RDS is a relational database service that is not optimized for key-value access patterns. It scales primarily vertically (larger instances) and does not provide the same horizontal scalability and low-latency performance as a NoSQL database for this use case.
- ✗
Amazon Redshift
Why it's wrong here
Amazon Redshift is a data warehouse service designed for analytical queries on large datasets. It is not suitable for real-time, low-latency key-value lookups and does not support the access patterns required for player profiles and session state.
- ✓
Amazon DynamoDB
Why this is correct
Correct. Amazon DynamoDB is a fully managed NoSQL key-value and document database that provides single-digit millisecond latency at any scale. It scales horizontally, supports auto scaling, and offers built-in multi-AZ replication for high availability and durability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon ElastiCache for Redis
Why it's wrong here
Amazon ElastiCache is an in-memory caching service that provides low latency but is not designed as a durable primary datastore. While it can store session data, it lacks the persistence, durability guarantees, and managed scaling features that DynamoDB offers for a primary database.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Amazon ElastiCache for Redis with a durable database, but it is an in-memory cache that lacks native multi-AZ replication for persistence and is not designed as a primary key-value store for session state that must survive node failures.
Detailed technical explanation
How to think about this question
DynamoDB achieves single-digit millisecond latency through its distributed architecture where data is automatically partitioned across multiple storage nodes using consistent hashing, and each partition is replicated across three AZs within an AWS Region. The service uses SSD-backed storage and a write-ahead log to ensure durability, while its adaptive capacity feature automatically adjusts partitions as traffic grows, eliminating the need for manual re-sharding. In a real-world gaming scenario, DynamoDB can handle millions of concurrent requests for player session data by using DAX (DynamoDB Accelerator) for microsecond caching, but the base service already meets the stated latency requirements.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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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 the correct choice because it is a fully managed, serverless, NoSQL key-value database that delivers single-digit millisecond latency at any scale. It supports horizontal scaling via automatic partitioning and replication across multiple Availability Zones (AZs) for high availability, with no downtime required for scaling. This directly matches the gaming company's requirements for low-latency reads/writes, unpredictable traffic growth, and built-in multi-AZ replication.
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.
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
1 more ways this is tested on CLF-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 company runs a real-time bidding platform for online advertising. The platform requires a database that can handle millions of requests per second with single-digit millisecond latency for both reads and writes. The data model is simple key-value pairs, and the database must be fully managed so that the company does not have to provision or maintain servers. Which AWS database service should the company use to meet these requirements?
medium- A.Amazon RDS
- ✓ B.Amazon DynamoDB
- C.Amazon Redshift
- D.Amazon ElastiCache
Why B: Amazon DynamoDB is the correct choice because it is a fully managed NoSQL key-value and document database that delivers single-digit millisecond latency at any scale, handling millions of requests per second. Its serverless architecture eliminates the need to provision or manage servers, making it ideal for real-time bidding platforms with simple key-value data models and high-throughput, low-latency requirements.
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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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