DEA-C01 Data Store Management Practice Question
A company is using Amazon RDS for MySQL and needs to reduce read latency for a global user base. Which AWS feature should be implemented?
⚠ Common exam trap
A common mix-up: candidates confuse Multi-AZ (high availability) with Read Replicas (read scaling), or they assume Cross-Region Replication is a separate feature when it is actually implemented via Read Replicas in RDS MySQL.
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
✓
Read Replicas
Amazon RDS Read Replicas allow you to offload read traffic from the primary DB instance to one or more read-only copies, which can be placed in different AWS Regions to reduce read latency for a global user base. Unlike Multi-AZ, which is designed for high availability, Read Replicas directly address read performance and latency by distributing read queries closer to users. Cross-Region Replication for RDS MySQL is achieved through Read Replicas, making option C the correct choice for reducing read latency globally.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Multi-AZ deployment
Why it's wrong here
Multi-AZ provides high availability, not read replica functionality.
- ✗
Aurora Auto Scaling
Why it's wrong here
Auto Scaling adjusts capacity based on load, not specifically for read latency.
- ✓
Read Replicas
Why this is correct
Read Replicas allow offloading read queries to reduce latency.
- ✗
Cross-Region Replication
Why it's wrong here
Cross-region replication has higher latency and is for disaster recovery.
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