DEA-C01 Data Store Management Practice Question
A data engineer is designing a multi-region disaster recovery solution for Amazon RDS for PostgreSQL. The primary region must have a standby in a different Availability Zone, and the secondary region must have a readable replica that can be promoted in case of failure. Which configuration meets these requirements?
⚠ Common exam trap
A common mix-up: candidates confuse Multi-AZ (synchronous, for high availability within a region) with cross-region read replicas (asynchronous, for disaster recovery), and may incorrectly assume that Multi-AZ alone provides cross-region failover or that a single-AZ primary with a read replica satisfies the intra-region standby requirement.
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
✓
Enable Multi-AZ in the primary region and create a cross-region read replica
It meets both requirements: Multi-AZ in the primary region provides a synchronous standby in a different Availability Zone for high availability, and a cross-region read replica in the secondary region provides an asynchronous, readable copy that can be promoted to a standalone primary during a regional failure. This combination ensures both intra-region fault tolerance and inter-region disaster recovery.
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 a single-AZ primary and enable automatic backups
Why it's wrong here
No standby and no cross-region replica.
- ✓
Enable Multi-AZ in the primary region and create a cross-region read replica
Why this is correct
Multi-AZ provides standby; cross-region replica provides DR.
- ✗
Use a single-AZ primary and create a cross-region read replica
Why it's wrong here
No standby within primary region.
- ✗
Enable Multi-AZ in both primary and secondary regions
Why it's wrong here
Multi-AZ in secondary region is not necessary; no cross-region replica.
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