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 startup is building a real-time leaderboard for a mobile game using Amazon DynamoDB. The leaderboard must update frequently and support global access with low latency. Which database design approach is most suitable?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Amazon DynamoDB global tables with appropriate partition key design.
Amazon DynamoDB global tables provide multi-Region, fully managed, multi-master replication, which is ideal for a real-time leaderboard requiring frequent updates and low-latency global access. By designing an appropriate partition key (e.g., game ID or time-based composite key), you can distribute write traffic evenly and avoid hot partitions, ensuring consistent performance under high update frequency.
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.
✓
Use Amazon DynamoDB global tables with appropriate partition key design.
Why this is correct
Provides low-latency global access and high throughput.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Amazon ElastiCache for Redis with replication across Regions.
Why it's wrong here
In-memory cache lacks durability guarantees.
✗
Use Amazon Aurora Global Database with a single writer and multiple readers.
Why it's wrong here
Relational model not ideal for leaderboard; global latency possible.
✗
Use Amazon S3 with event notifications to update a leaderboard file.
Why it's wrong here
S3 is not designed for high-frequency writes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a caching layer like ElastiCache is always the best for low-latency global access, but they overlook the need for multi-Region write capability and the inherent limitations of Redis cross-Region replication for high-frequency updates.
Detailed technical explanation
How to think about this question
DynamoDB global tables use a last-writer-wins (LWW) conflict resolution mechanism based on timestamps, which works well for leaderboard scores where the latest value is authoritative. Under the hood, each regional replica accepts writes independently and asynchronously replicates to other regions within seconds, typically achieving single-digit millisecond latency for reads and writes. In a real-world scenario, a poorly chosen partition key (e.g., using only game ID) could lead to a hot partition if all players update the same key simultaneously, so a composite key like gameID#timestamp or using DynamoDB adaptive capacity is 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.
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 DynamoDB global tables with appropriate partition key design. — Amazon DynamoDB global tables provide multi-Region, fully managed, multi-master replication, which is ideal for a real-time leaderboard requiring frequent updates and low-latency global access. By designing an appropriate partition key (e.g., game ID or time-based composite key), you can distribute write traffic evenly and avoid hot partitions, ensuring consistent performance under high update frequency.
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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