How can these requirements be met?

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A SysOps Administrator is managing an application that runs on Amazon EC2 instances behind an Application Load Balancer.The instances run in an AutoScaling group across multiple Availability Zones.The application stores data in an Amazon RDS MySQL DB instance.The Administrator must ensure that that application stays available if the database becomes unresponsive.

How can these requirements be met?

Create read replicas for the RDS database and use them in case of a database failure

Create a new RDS instance from the snapshot of the original RDS instance if a failure occurs

Keep a separate RDS database running and switch the endpoint in the web application if a failure occurs

Modify the RDS instance to be a Multi-AZ deployment

Explanations:

Read replicas are intended for read scalability, not failover. They do not automatically handle failover in case of database unresponsiveness.

Creating a new RDS instance from a snapshot is a manual process that would require downtime. It doesn’t provide automatic failover.

Maintaining a separate RDS instance for failover requires manual intervention to switch endpoints, which would lead to downtime and is not an automated failover solution.

A Multi-AZ deployment provides automatic failover to a standby database in case of failure, ensuring high availability for the RDS instance.

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