The answer is Amazon Aurora Global Database with reader instances in Europe and Asia because it is the only AWS-managed relational database service that provides dedicated reader instances in up to five secondary regions with storage-based replication, typically adding less than one second of lag. This architecture directly addresses global database read latency optimization by placing read replicas physically close to users in Europe and Asia, while Aurora’s replication engine maintains strong data consistency without the overhead of synchronous cross-region writes. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of when to choose Aurora Global Database over alternatives like cross-region Read Replicas in RDS or DynamoDB global tables—the key trap is assuming that any cross-region replica offers the same low latency, but only Aurora Global Database provides dedicated reader instances with sub-second replication lag. Remember the memory tip: “Global Aurora, local reads—one second or less for global needs.”
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. 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 runs a global e-commerce platform with a relational database. They need to reduce read latency for users in Europe and Asia. The primary database is in us-west-2. Which solution provides the LOWEST read latency for global users while maintaining data consistency?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Amazon Aurora Global Database with reader instances in Europe and Asia
Amazon Aurora Global Database is designed for low-latency global reads by replicating data to up to five secondary regions with dedicated reader instances. It uses storage-based replication that typically adds less than one second of lag, ensuring strong consistency while providing local read access for users in Europe and Asia. This architecture directly addresses the requirement for the lowest read latency without compromising data consistency.
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 ElastiCache clusters in each region and cache database queries
Why it's wrong here
Caching adds eventual consistency and complexity; not the lowest latency for consistent reads.
✓
Use Amazon Aurora Global Database with reader instances in Europe and Asia
Why this is correct
Aurora Global Database provides cross-region read replicas with <1 second latency, enabling low-latency local reads.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Migrate to Amazon DynamoDB global tables
Why it's wrong here
DynamoDB is NoSQL and would require application changes.
✗
Configure Amazon RDS cross-region read replicas
Why it's wrong here
RDS cross-region replicas are asynchronous and intended for disaster recovery, not low latency reads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose ElastiCache (Option A) thinking caching always provides the lowest latency, but they overlook the requirement for data consistency and the fact that caching does not replicate the full database state across regions.
Detailed technical explanation
How to think about this question
Aurora Global Database leverages a dedicated storage layer that replicates data at the storage volume level, using a log-based replication mechanism that achieves sub-second replication lag. The reader instances in secondary regions can serve read traffic directly from local storage, eliminating cross-region network latency for queries. This design is particularly effective for global applications where read consistency is critical, as it avoids the eventual consistency model of cache-based solutions.
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.
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 Amazon Aurora Global Database with reader instances in Europe and Asia — Amazon Aurora Global Database is designed for low-latency global reads by replicating data to up to five secondary regions with dedicated reader instances. It uses storage-based replication that typically adds less than one second of lag, ensuring strong consistency while providing local read access for users in Europe and Asia. This architecture directly addresses the requirement for the lowest read latency without compromising data consistency.
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.
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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Question Discussion
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