The answer is Amazon DynamoDB. This fully managed NoSQL key-value and document database is the correct choice for a microservices architecture that needs to minimize operational overhead because it eliminates the need for manual scaling, patching, or replication, while providing single-digit millisecond latency at any scale. Its pay-per-request billing model aligns perfectly with the unpredictable traffic patterns common in microservices, and its RESTful API support enables seamless service-to-service communication without managing infrastructure. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of the trade-off between operational overhead and data consistency—DynamoDB is the go-to for stateless, high-throughput services, but beware of trap answers like Amazon RDS or self-managed databases that require more administrative effort. A common memory tip: when you see “minimize operational overhead” and “each microservice stores its own data,” think of DynamoDB as the “set it and forget it” data store for serverless, decoupled architectures.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 architecture on AWS. Each microservice must store its own data and communicate with other services via RESTful APIs. The company wants to minimize operational overhead. Which data store should the company use for each microservice?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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 provides single-digit millisecond latency at any scale, making it ideal for microservices that need to store their own data and communicate via RESTful APIs. It requires no operational overhead for scaling, patching, or replication, and its pay-per-request billing aligns with the unpredictable traffic patterns common in microservices architectures.
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 ElastiCache for Redis
Why it's wrong here
ElastiCache is a caching service, not intended for durable data storage.
✗
Amazon Redshift
Why it's wrong here
Redshift is a petabyte-scale data warehouse, not designed for microservices data stores.
✗
Amazon RDS for PostgreSQL
Why it's wrong here
RDS is a managed service but still requires manual scaling and patching, adding overhead.
✓
Amazon DynamoDB
Why this is correct
DynamoDB is fully managed, serverless, and scales automatically, ideal for microservices.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Amazon RDS for PostgreSQL because they assume relational databases are required for structured data, but the question emphasizes minimizing operational overhead, and DynamoDB's serverless, fully managed nature eliminates the need for schema management, scaling, and patching that RDS still requires.
Detailed technical explanation
How to think about this question
DynamoDB uses a distributed hash table architecture with automatic partitioning and replication across three Availability Zones, ensuring high availability and durability. Its on-demand capacity mode allows microservices to scale from zero to thousands of requests per second without provisioning, and its support for TTL (Time to Live) enables automatic data expiration for session or event data. In practice, DynamoDB's single-table design pattern with composite keys (partition key + sort key) is commonly used to model hierarchical relationships and access patterns for microservices, avoiding the need for complex joins.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
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 provides single-digit millisecond latency at any scale, making it ideal for microservices that need to store their own data and communicate via RESTful APIs. It requires no operational overhead for scaling, patching, or replication, and its pay-per-request billing aligns with the unpredictable traffic patterns common in microservices architectures.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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