- A
Amazon DynamoDB
Amazon DynamoDB is a NoSQL database that delivers single-digit millisecond latency, is fully managed, and replicates data across multiple AZs automatically. It is ideal for stateful microservices.
- B
Amazon S3
Why wrong: Amazon S3 has higher latency and is not designed for sub-millisecond access patterns. It is better suited for object storage, not stateful data requiring low-latency reads/writes.
- C
Amazon RDS with Multi-AZ
Why wrong: Amazon RDS provides relational databases with Multi-AZ for high availability, but it has higher latency than DynamoDB for simple key-value operations and is not as scalable.
- D
Amazon ElastiCache for Redis
Why wrong: Amazon ElastiCache is an in-memory cache, not a durable data store by default. While it can be made durable with persistence, it is typically used for caching, not as the primary data store.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. 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 designing a new microservices application on AWS. Each microservice needs to store and retrieve stateful data with low latency (single-digit milliseconds). The data must be durable and highly available across multiple Availability Zones. Which AWS service should be used for the primary data store for each microservice?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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 is designed for high availability and durability by automatically replicating data across three Availability Zones in an AWS Region, meeting the requirements for stateful microservices data storage.
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 DynamoDB
Why this is correct
Amazon DynamoDB is a NoSQL database that delivers single-digit millisecond latency, is fully managed, and replicates data across multiple AZs automatically. It is ideal for stateful microservices.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3
Why it's wrong here
Amazon S3 has higher latency and is not designed for sub-millisecond access patterns. It is better suited for object storage, not stateful data requiring low-latency reads/writes.
- ✗
Amazon RDS with Multi-AZ
Why it's wrong here
Amazon RDS provides relational databases with Multi-AZ for high availability, but it has higher latency than DynamoDB for simple key-value operations and is not as scalable.
- ✗
Amazon ElastiCache for Redis
Why it's wrong here
Amazon ElastiCache is an in-memory cache, not a durable data store by default. While it can be made durable with persistence, it is typically used for caching, not as the primary data store.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The SAP-C02 exam often tests the distinction between a durable primary data store and a cache or object store, where candidates mistakenly choose ElastiCache for its low latency without considering durability, or S3 for its high availability without recognizing its higher latency profile.
Detailed technical explanation
How to think about this question
DynamoDB achieves single-digit millisecond latency through its distributed architecture where data is partitioned across multiple storage nodes using consistent hashing, and each item is replicated synchronously to three Availability Zones. The service uses SSD-backed storage and a leaderless replication model, ensuring that writes are acknowledged only after durable storage in multiple AZs, which provides strong consistency when using the 'ConsistentRead' parameter. In practice, this makes DynamoDB ideal for session state, gaming leaderboards, and IoT metadata where low latency and high availability are critical.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — 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 is designed for high availability and durability by automatically replicating data across three Availability Zones in an AWS Region, meeting the requirements for stateful microservices data storage.
What should I do if I get this SAP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This SAP-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 SAP-C02 exam.
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