DBS-C01 Workload-Specific Database Design Practice Question
A company is designing a database for an analytics workload that requires storing 5 TB of data and running complex SQL queries with joins. The workload is read-heavy and requires high concurrency. Which TWO services are suitable for this workload? (Choose two.)
⚠ Common exam trap
It's easy for candidates to confuse read-heavy OLTP workloads with analytical workloads, assuming ElastiCache or DynamoDB can handle complex SQL joins, when in fact they lack relational query capabilities and are designed for different access patterns.
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 RDS for MySQL with read replicas
Amazon RDS for MySQL with read replicas is suitable because the workload is read-heavy and requires high concurrency. Read replicas offload SELECT traffic from the primary instance, allowing complex SQL queries with joins to scale horizontally while maintaining ACID compliance for the 5 TB dataset.
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 RDS for MySQL with read replicas
Why this is correct
Supports joins and read replicas for concurrency.
- ✓
Amazon Redshift
Why this is correct
Optimized for complex SQL queries on large data.
- ✗
Amazon ElastiCache for Redis
Why it's wrong here
Cache, not primary database.
- ✗
Amazon DynamoDB
Why it's wrong here
NoSQL, not suited for complex joins.
- ✗
Amazon S3
Why it's wrong here
Object storage, not a database.
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