A company runs a critical database on Amazon RDS for PostgreSQL. The database must remain available even if an entire AWS Availability Zone goes offline. What is the MOST cost-effective way to achieve this?

Answer options:

Create a Read Replica in a different AWS Region.

Enable Multi-AZ deployment for the RDS instance.

Take hourly automated snapshots and restore them if the AZ fails.

Migrate the database to Amazon DynamoDB Global Tables.

How to approach this question

Look for 'Availability Zone goes offline' and 'remain available'. RDS Multi-AZ is designed exactly for this.

Full Answer

B.Enable Multi-AZ deployment for the RDS instance.✓ Correct

Enable Multi-AZ deployment for the RDS instance.

Amazon RDS Multi-AZ deployments provide enhanced availability and durability. RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone.

Common mistakes

Confusing Read Replicas (for performance) with Multi-AZ (for high availability).

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