The answer is Amazon DynamoDB with global tables because it uniquely delivers single-digit millisecond read latency, multi-Region high availability, and strong consistency for a global e-commerce workload. DynamoDB global tables use a distributed, multi-leader architecture that replicates data across AWS Regions, and by enabling the ConsistentRead parameter on GetItem or Query operations, you can achieve strongly consistent reads even across regions—a capability not natively offered by other globally replicated services like Aurora Global Database. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of trade-offs between consistency models and global replication; a common trap is assuming DynamoDB only offers eventual consistency across regions, but the key is that global tables support strong consistency when explicitly requested. Remember the memory tip: “Global tables, strong reads—just flip the ConsistentRead switch.”
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. 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 database for a global e-commerce application with millions of users. The workload requires single-digit millisecond read latency, high availability across multiple AWS Regions, and strong consistency. Which database service should the company use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon DynamoDB with global tables
Amazon DynamoDB with global tables is the correct choice because it provides single-digit millisecond read latency at any scale, supports multi-Region active-active replication for high availability, and offers strongly consistent reads (when using the ConsistentRead parameter) across regions via its distributed, multi-leader architecture. This combination uniquely satisfies all three requirements—low latency, global HA, and strong consistency—for a high-traffic e-commerce workload.
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 layer, not a primary database with strong consistency.
✗
Amazon Aurora Global Database
Why it's wrong here
Aurora provides low latency but not consistently single-digit millisecond for all reads.
✗
Amazon Neptune
Why it's wrong here
Neptune is optimized for graph workloads, not general-purpose high-throughput reads.
✓
Amazon DynamoDB with global tables
Why this is correct
DynamoDB offers single-digit millisecond latency, global tables for multi-region replication, and strong consistency.
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 confuse Amazon Aurora Global Database’s cross-Region replication with strong consistency, but Aurora Global Database only provides eventual consistency for reads from secondary regions, making it unsuitable when strong consistency is required across all regions.
Detailed technical explanation
How to think about this question
DynamoDB global tables use a multi-leader replication protocol based on the DynamoDB Streams and a last-writer-wins (LWW) conflict resolution mechanism, which ensures that writes are eventually propagated to all regions. To achieve strong consistency, the application must use the ConsistentRead parameter set to true, which reads from the leader in the local region; however, this may incur a slight latency penalty if the leader is not local, but DynamoDB’s distributed architecture typically keeps reads under 10 ms. In practice, for a global e-commerce app, you would design the read path to use strongly consistent reads only for critical operations (e.g., inventory checks) and eventually consistent reads for less sensitive data to balance performance.
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.
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: Amazon DynamoDB with global tables — Amazon DynamoDB with global tables is the correct choice because it provides single-digit millisecond read latency at any scale, supports multi-Region active-active replication for high availability, and offers strongly consistent reads (when using the ConsistentRead parameter) across regions via its distributed, multi-leader architecture. This combination uniquely satisfies all three requirements—low latency, global HA, and strong consistency—for a high-traffic e-commerce workload.
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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