CV0-004 Cloud Architecture and Design Practice Question
A cloud architect is designing a new application that must be highly available across multiple geographic regions. The application uses a relational database that must be writable in the primary region and readable in a secondary region with minimal replication lag. Which AWS database feature should the architect implement to meet these requirements?
⚠ Common exam trap
Test-takers frequently confuse Multi-AZ with multi-region; Multi-AZ is for high availability within a region, not for cross-region read scaling.
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 Aurora Global Database
The requirement is for a relational database that is writable in one region and readable in another with minimal replication lag. Amazon Aurora Global Database provides exactly this: a primary region for writes and secondary regions for reads with sub-second replication lag. Other options either do not support cross-region replication or do not provide the required low lag and relational capabilities.
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 DynamoDB global tables
Why it's wrong here
Amazon DynamoDB global tables provide a multi-region, multi-active database, but they are NoSQL and do not support relational workloads. The scenario specifies a relational database. While global tables offer low-latency reads and writes in multiple regions, they are not suitable for applications requiring SQL and relational schemas.
- ✗
Amazon RDS Multi-AZ deployment
Why it's wrong here
Amazon RDS Multi-AZ provides a synchronous standby in a different Availability Zone within the same region, not cross-region read replicas. It does not support cross-region read scaling or writable secondary regions. This feature is for high availability within a region, not for multi-region read access with low replication lag.
- ✓
Amazon Aurora Global Database
Why this is correct
Amazon Aurora Global Database is designed for multi-region applications, providing a primary region that is writable and secondary regions that are read-only with typical replication lag under one second. It uses dedicated replication infrastructure for low latency and supports fast failover. This meets the requirements for a writable primary and low-lag readable secondary region.
- ✗
Amazon RDS read replicas in a secondary region
Why it's wrong here
Cross-region read replicas are supported for Amazon RDS, but they are asynchronous and can have higher replication lag than other solutions. They also do not provide a writable secondary region; the replica is read-only. The requirement for minimal replication lag and writability in the primary region is better met by another option.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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