AWS Certified SysOps Administrator SOA-C01 – Question113

A user has enabled the Multi AZ feature with the MS SQL RDS database server. Which of the below mentioned statements will help the user understand the Multi AZ feature better?

A. In a Multi AZ, AWS runs two DBs in parallel and copies the data asynchronously to the replica copy
B. In a Multi AZ, AWS runs two DBs in parallel and copies the data synchronously to the replica copy
C. In a Multi AZ, AWS runs just one DB but copies the data synchronously to the standby replica
D. AWS MS SQL does not support the Multi AZ feature

Correct Answer: C

Explanation:

Explanation: Amazon RDS provides high availability and failover support for DB instances using Multi-AZ deployments.
In a Multi-AZ deployment, Amazon RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone. The primary DB instance is synchronously replicated across Availability Zones to a standby replica to provide data redundancy, eliminate I/O freezes, and minimize latency spikes during system backups. Running a DB instance with high availability can enhance availability during planned system maintenance, and help protect your databases against DB instance failure and Availability Zone disruption. Note that the high-availability feature is not a scaling solution for read-only scenarios; you cannot use a standby replica to serve read traffic. To service read-only traffic, you should use a read replica.