The correct answer is to use DynamoDB global tables to replicate data to Regions close to users. This configuration achieves sub-10ms read latency by placing a full replica of the table in each AWS Region where users are located, allowing reads to be served locally from the nearest Region rather than traversing the network. DynamoDB global tables use asynchronous, multi-region replication with eventual consistency, and they resolve write conflicts using a last-writer-wins (LWW) algorithm, which minimizes conflict complexity for infrequent writes like user profiles. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of trade-offs between read latency and write conflict resolution—a common trap is choosing DAX or read replicas, which only help within a single Region. Remember the memory tip: “Global tables for global reads; local caches for local speeds.”
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 deploying a globally distributed application with users in the US, Europe, and Asia. The application requires sub-10ms read latency for user profiles stored in Amazon DynamoDB. Writes are less frequent. Which configuration meets the latency requirement while minimizing write conflicts?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use DynamoDB global tables to replicate data to Regions close to users.
DynamoDB global tables provide multi-region, multi-active replication with eventual consistency, enabling sub-10ms reads from local replicas while writes are replicated asynchronously. This minimizes write conflicts because DynamoDB uses last-writer-wins (LWW) conflict resolution, which is acceptable for user profiles where writes are infrequent and conflicts are rare.
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.
✗
Deploy Amazon RDS for MySQL with Multi-AZ and cross-Region read replicas.
Why it's wrong here
RDS read replicas are asynchronous and may have stale data; also higher latency.
✗
Use Amazon ElastiCache for Redis Global Datastore with DynamoDB as backing store.
Why it's wrong here
ElastiCache is a cache, not a durable database; adds complexity.
✗
Deploy a single DynamoDB table in us-east-1 with DAX caches in each region.
Why it's wrong here
Reads from other regions still incur cross-region latency to the table.
✓
Use DynamoDB global tables to replicate data to Regions close to users.
Why this is correct
Global tables provide multi-region writes and reads with low latency.
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 may confuse DynamoDB global tables with DAX caching, assuming that a local cache alone can solve global latency without addressing write replication and conflict resolution.
Detailed technical explanation
How to think about this question
DynamoDB global tables use a multi-leader replication model where each region accepts writes and propagates changes asynchronously using DynamoDB Streams and a last-writer-wins (LWW) conflict resolution mechanism based on the timestamp. For user profiles with infrequent writes, LWW is typically sufficient, but if stronger conflict resolution is needed, application-level logic (e.g., conditional writes or versioning) must be implemented. The sub-10ms read latency is achieved by reading from a local replica in the user's region, bypassing cross-Region network round trips.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use DynamoDB global tables to replicate data to Regions close to users. — DynamoDB global tables provide multi-region, multi-active replication with eventual consistency, enabling sub-10ms reads from local replicas while writes are replicated asynchronously. This minimizes write conflicts because DynamoDB uses last-writer-wins (LWW) conflict resolution, which is acceptable for user profiles where writes are infrequent and conflicts are rare.
What should I do if I get this DBS-C01 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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Question Discussion
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