DBS-C01 Workload-Specific Database Design Practice Question
A startup is building a real-time leaderboard for a gaming application. The data is highly dynamic with frequent updates and requires single-digit millisecond latency. Which database is most suitable?
⚠ Common exam trap
The DBS-C01 exam often tests the misconception that a relational database like PostgreSQL is inherently faster for all real-time workloads, but the trap here is that the question explicitly requires 'single-digit millisecond latency' and 'highly dynamic with frequent updates'—characteristics that DynamoDB's NoSQL architecture is specifically designed to meet, whereas RDS for PostgreSQL would introduce latency from locking, indexing overhead, and connection pooling that prevents it from consistently achieving that performance under high write loads.
Answer choices
Why each option matters
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 the most suitable choice because it is a fully managed NoSQL key-value and document database that delivers single-digit millisecond latency at any scale, making it ideal for real-time leaderboards with high-frequency updates. Its DAX (DynamoDB Accelerator) caching layer can further reduce read latency to microseconds, while its auto-scaling and on-demand capacity modes handle the highly dynamic workload without downtime.
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 Neptune
Why it's wrong here
Neptune is a graph database, not optimized for simple key-value access patterns.
- ✗
Amazon Redshift
Why it's wrong here
Redshift is designed for analytical queries on large datasets, not real-time updates.
- ✓
Amazon DynamoDB
Why this is correct
DynamoDB offers consistent single-digit millisecond performance, ideal for real-time leaderboards.
- ✗
Amazon RDS for PostgreSQL
Why it's wrong here
RDS has higher latency and is not optimized for high-frequency updates at scale.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.