AWS Certified CloudOps Engineer Associate SOA-C03 Practice Question
A company runs a mission-critical PostgreSQL database on Amazon RDS in a single Availability Zone. An AZ failure last month took the application offline for 40 minutes while the team restored a snapshot in another AZ. Management wants a fault-tolerant solution that automatically fails over to another AZ with minimal data loss and without requiring any change to the application connection string. Which solution meets these requirements at the lowest ongoing cost?
Create a cross-Region read replica and promote it automatically by using Amazon Route 53 health checks.
Set up an AWS Backup plan to take hourly snapshots and use AWS Lambda to restore the latest snapshot in another AZ on failure.
Modify the DB instance to enable Amazon RDS Multi-AZ, creating a synchronous standby in a separate Availability Zone.
Migrate the database to Amazon Aurora Serverless v2 with a global database for failover.
Converting the existing Amazon RDS for PostgreSQL instance to a Multi-AZ deployment provisions a synchronous standby in a different Availability Zone. RDS automatically performs failover to the standby if the primary AZ becomes unavailable, typically within 60-120 seconds. Because the primary and standby share a single DNS endpoint, no application changes are required. Multi-AZ uses synchronous replication, so data loss is minimal. Read replicas, snapshot restores, or a full migration to another service either require manual intervention, application modifications, or provide lower durability and higher cost for the stated requirements.
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AWS Certified CloudOps Engineer Associate SOA-C03
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