- A
Amazon RDS
Why wrong: Amazon RDS is a managed relational database service. It supports traditional SQL databases like MySQL and PostgreSQL, but it is not designed for key-value workloads requiring millions of requests per second with single-digit millisecond latency. Scaling to that level with RDS would require complex sharding and still may not meet the latency requirements.
- B
Amazon DynamoDB
Amazon DynamoDB is a fully managed NoSQL key-value and document database that delivers single-digit millisecond latency at any scale. It automatically scales to handle millions of requests per second and requires no server provisioning, making it the perfect fit for a real-time bidding platform with high-throughput, low-latency key-value access.
- C
Amazon Redshift
Why wrong: Amazon Redshift is a petabyte-scale data warehouse service optimized for complex analytical queries on large datasets. It is not suitable for real-time, high-throughput key-value workloads requiring microsecond or single-digit millisecond latency. Redshift is designed for batch processing and reporting, not for transactional or interactive low-latency access.
- D
Amazon ElastiCache
Why wrong: Amazon ElastiCache provides in-memory caching using Redis or Memcached. While it offers low latency, it is not a durable primary database; data is stored in memory and can be lost on failure. For a real-time bidding platform that requires data persistence, ElastiCache serves best as a cache in front of a database like DynamoDB, not as the primary data store.
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 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?
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, 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.
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
Why it's wrong here
Amazon RDS is a managed relational database service. It supports traditional SQL databases like MySQL and PostgreSQL, but it is not designed for key-value workloads requiring millions of requests per second with single-digit millisecond latency. Scaling to that level with RDS would require complex sharding and still may not meet the latency requirements.
- ✓
Amazon DynamoDB
Why this is correct
Amazon DynamoDB is a fully managed NoSQL key-value and document database that delivers single-digit millisecond latency at any scale. It automatically scales to handle millions of requests per second and requires no server provisioning, making it the perfect fit for a real-time bidding platform with high-throughput, low-latency key-value access.
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 service optimized for complex analytical queries on large datasets. It is not suitable for real-time, high-throughput key-value workloads requiring microsecond or single-digit millisecond latency. Redshift is designed for batch processing and reporting, not for transactional or interactive low-latency access.
- ✗
Amazon ElastiCache
Why it's wrong here
Amazon ElastiCache provides in-memory caching using Redis or Memcached. While it offers low latency, it is not a durable primary database; data is stored in memory and can be lost on failure. For a real-time bidding platform that requires data persistence, ElastiCache serves best as a cache in front of a database like DynamoDB, not as the primary data store.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse ElastiCache (a caching layer) with a primary database, overlooking DynamoDB's fully managed, serverless nature and its native support for high-throughput key-value workloads with persistent storage.
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 of the partition key. It offers two read consistency models—eventually consistent and strongly consistent—with eventually consistent reads typically returning results in under 10 milliseconds. In a real-time bidding scenario, DynamoDB's auto-scaling can handle traffic spikes by dynamically adjusting throughput capacity without downtime, and its DAX (DynamoDB Accelerator) can further reduce read latency to microseconds for cacheable workloads.
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 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.
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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