AWS Certified Solutions Architect - Associate
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A solutions architect must create a disaster recovery (DR) plan for a high-volume software as a service (SaaS) platform. All data for the platform is stored in an Amazon Aurora MySQL DB cluster. The DR plan must replicate data to a secondary AWS Region. Which solution will meet these requirements MOST cost-effectively?
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A
Use MySQL binary log replication to an Aurora cluster in the secondary Region. Provision one DB instance for the Aurora cluster in the secondary Region.
B
Set up an Aurora global database for the DB cluster. When setup is complete, remove the DB instance from the secondary Region.
C
Use AWS Database Migration Service (AWS DMS) to continuously replicate data to an Aurora cluster in the secondary Region. Remove the DB instance from the secondary Region.
D
Set up an Aurora global database for the DB cluster. Specify a minimum of one DB instance in the secondary Region.
Explanation:
Explanation
Option D is the correct answer because it provides the most cost-effective solution for disaster recovery with Aurora MySQL.
Analysis of Each Option:
Option A: MySQL binary log replication
- This requires manual setup and management of binary log replication
- You still need to provision a DB instance in the secondary Region (which incurs costs)
- More complex to manage and maintain compared to native AWS solutions
- Not the most cost-effective option
Option B: Aurora global database with removal of secondary instance
- Aurora global database requires at least one DB instance in the secondary Region to function
- Removing the DB instance would break the replication functionality
- Aurora global database needs active instances in secondary Regions to maintain replication
- This option is not feasible
Option C: AWS DMS with instance removal
- AWS DMS requires continuous replication tasks which incur additional costs
- Removing the DB instance in the secondary Region would mean there's no database to replicate to
- DMS has ongoing costs for replication tasks
- Not cost-effective compared to native Aurora solutions
Option D: Aurora global database with minimum one DB instance
- Most cost-effective: Aurora global database provides built-in cross-region replication with minimal overhead
- Native solution: No additional services or complex setup required
- Automatic failover: Built-in failover capabilities to secondary Region
- Low latency: Uses dedicated infrastructure for replication
- Cost-efficient: Only pay for the DB instance in the secondary Region, no additional replication service costs
- Scalable: Can add more instances in secondary Region if needed
- Managed: AWS handles the replication infrastructure
Why Option D is Best:
- Aurora global database is specifically designed for cross-region disaster recovery scenarios
- Minimal instance configuration (one instance) keeps costs low while maintaining DR readiness
- No additional service costs - unlike DMS which has ongoing replication task costs
- Simplified management - AWS manages the replication infrastructure
- Automatic and continuous - data is replicated with typically less than 1 second latency
This solution meets the requirements for a high-volume SaaS platform by providing reliable cross-region replication while minimizing costs through Aurora's native global database feature.
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