- A
Amazon Aurora
Why wrong: Amazon Aurora is a relational database compatible with MySQL and PostgreSQL. While it offers high performance and multi-Region replication, it does not guarantee single-digit millisecond latency at the massive scale of millions of requests per second, nor does it provide the same seamless scaling as DynamoDB for high-velocity workloads.
- B
Amazon DynamoDB
Amazon DynamoDB is a fully managed NoSQL database that delivers consistent single-digit millisecond latency at any scale. It supports global tables for multi-Region replication and automatic scaling to handle millions of requests per second. It also provides built-in backup and restore, meeting all stated requirements.
- C
Amazon RDS for MySQL
Why wrong: Amazon RDS for MySQL is a relational database service that scales vertically and horizontally with read replicas, but it is not designed for single-digit millisecond latency at extreme throughput levels. It also requires manual sharding for very high write volumes and does not offer native multi-Region replication for disaster recovery.
- D
Amazon Redshift
Why wrong: Amazon Redshift is a petabyte-scale data warehouse service optimized for analytical queries and large-scale reporting. It is not suitable for low-latency transactional workloads and does not provide single-digit millisecond responsiveness for high-velocity read/write operations.
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 building a global e-commerce application that requires a database with single-digit millisecond latency, seamless scaling to handle millions of requests per second, and the ability to replicate data across multiple AWS Regions for disaster recovery and low-latency reads. The database must be fully managed with automatic backup and restores. Which AWS service should the company choose?
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 NoSQL key-value and document database that delivers single-digit millisecond latency at any scale, supports automatic multi-Region replication via DynamoDB Global Tables for disaster recovery and low-latency reads, and provides built-in backup and restore capabilities. This combination of performance, seamless scaling to millions of requests per second, and global replication aligns perfectly with the requirements of a global e-commerce application.
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 Aurora
Why it's wrong here
Amazon Aurora is a relational database compatible with MySQL and PostgreSQL. While it offers high performance and multi-Region replication, it does not guarantee single-digit millisecond latency at the massive scale of millions of requests per second, nor does it provide the same seamless scaling as DynamoDB for high-velocity workloads.
When this WOULD be correct
A company needs a relational database with ACID transactions, complex joins, and high availability within a single Region, requiring automatic failover and read replicas for read scaling, but not global multi-Region replication.
- ✓
Amazon DynamoDB
Why this is correct
Amazon DynamoDB is a fully managed NoSQL database that delivers consistent single-digit millisecond latency at any scale. It supports global tables for multi-Region replication and automatic scaling to handle millions of requests per second. It also provides built-in backup and restore, meeting all stated requirements.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon RDS for MySQL
Why it's wrong here
Amazon RDS for MySQL is a relational database service that scales vertically and horizontally with read replicas, but it is not designed for single-digit millisecond latency at extreme throughput levels. It also requires manual sharding for very high write volumes and does not offer native multi-Region replication for disaster recovery.
When this WOULD be correct
A company needs a fully managed relational database with automatic backups, point-in-time restore, and read replicas for read scaling within a single Region. The application requires complex SQL joins and transactions, but does not need multi-Region replication or sub-millisecond latency at massive scale.
- ✗
Amazon Redshift
Why it's wrong here
Amazon Redshift is a petabyte-scale data warehouse service optimized for analytical queries and large-scale reporting. It is not suitable for low-latency transactional workloads and does not provide single-digit millisecond responsiveness for high-velocity read/write operations.
When this WOULD be correct
A company needs a fully managed data warehouse for running complex analytical queries on petabytes of structured and semi-structured data, with automatic backups and the ability to scale compute and storage independently. The workload involves business intelligence and reporting, not real-time transactional processing.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Amazon DynamoDBCorrect answer▾
Why this is correct
Amazon DynamoDB is a fully managed NoSQL database that delivers consistent single-digit millisecond latency at any scale. It supports global tables for multi-Region replication and automatic scaling to handle millions of requests per second. It also provides built-in backup and restore, meeting all stated requirements.
✗Amazon AuroraWrong answer — click to see why▾
Why this is wrong here
Amazon Aurora, while fast, typically has latency in the low milliseconds but not consistently single-digit for millions of requests per second globally. It also lacks native multi-Region replication for disaster recovery with the same ease as DynamoDB's global tables.
★ When this WOULD be the correct answer
A company needs a relational database with ACID transactions, complex joins, and high availability within a single Region, requiring automatic failover and read replicas for read scaling, but not global multi-Region replication.
Why candidates choose this
Candidates may confuse Aurora's high performance and MySQL compatibility with the need for single-digit millisecond latency and global scaling, overlooking DynamoDB's key-value design optimized for such workloads.
✗Amazon RDS for MySQLWrong answer — click to see why▾
Why this is wrong here
Amazon RDS for MySQL does not natively support single-digit millisecond latency at millions of requests per second, nor does it provide seamless multi-Region replication for disaster recovery and low-latency reads. It is a relational database with limited horizontal scaling and higher latency under extreme load.
★ When this WOULD be the correct answer
A company needs a fully managed relational database with automatic backups, point-in-time restore, and read replicas for read scaling within a single Region. The application requires complex SQL joins and transactions, but does not need multi-Region replication or sub-millisecond latency at massive scale.
Why candidates choose this
Candidates may associate MySQL with web applications and assume RDS provides similar scalability and global replication as DynamoDB, overlooking the fundamental differences in data model and scaling capabilities.
✗Amazon RedshiftWrong answer — click to see why▾
Why this is wrong here
Amazon Redshift is a data warehouse optimized for analytical queries on large datasets, not for transactional workloads requiring single-digit millisecond latency and millions of requests per second. It does not support seamless scaling for high-frequency reads/writes or global replication for low-latency reads across multiple Regions.
★ When this WOULD be the correct answer
A company needs a fully managed data warehouse for running complex analytical queries on petabytes of structured and semi-structured data, with automatic backups and the ability to scale compute and storage independently. The workload involves business intelligence and reporting, not real-time transactional processing.
Why candidates choose this
Candidates may confuse Redshift's managed service and automatic backup features with transactional database requirements, or assume its columnar storage and parallel processing can handle high-throughput OLTP workloads.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Amazon Aurora because of its familiarity with relational databases and its 'high performance' reputation, but they overlook the specific requirement for single-digit millisecond latency at millions of requests per second, which is a key-value/NoSQL workload that DynamoDB is purpose-built for, not a relational database.
Detailed technical explanation
How to think about this question
DynamoDB achieves single-digit millisecond latency through its distributed architecture that partitions data across multiple nodes using consistent hashing, and it scales automatically by splitting partitions as throughput increases. DynamoDB Global Tables use active-active replication across AWS Regions, leveraging DynamoDB Streams to capture item-level changes and propagate them asynchronously with eventual consistency, enabling low-latency reads from any region while maintaining disaster recovery capabilities. The service also offers point-in-time recovery (PITR) and on-demand backup, ensuring automated restores without manual intervention.
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
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 the correct choice because it is a fully managed NoSQL key-value and document database that delivers single-digit millisecond latency at any scale, supports automatic multi-Region replication via DynamoDB Global Tables for disaster recovery and low-latency reads, and provides built-in backup and restore capabilities. This combination of performance, seamless scaling to millions of requests per second, and global replication aligns perfectly with the requirements of a global e-commerce application.
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 →
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Last reviewed: Jun 11, 2026
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