RDS Quiz
An application currently consists of an EC2 Instance hosting a Web application. The Web application connects to an AWS RDS database. Which of the following can be used to ensure that the database layer is highly available?
A. Create another EC2 Instance in another Availability Zone and host a replica of thedatabase.
B. Create another EC2 Instance in another Availability Zone and host a replica of the Webserver.
C. Enable Read Replica for the AWS RDS database.
D. Enable Multi-AZ for the AWS RDS database.
D. Enable Multi-AZ for the AWS RDS database.
AWS Documentation mentions the following:
Amazon RDS Multi-AZ deployments provide enhanced availability and durability for Database (DB) Instances, making them a natural fit for production database workloads. When you provision a Multi-AZ DB Instance, Amazon RDS automatically creates a primary DB Instance and synchronously replicates the data to a standby instance in a different Availability Zone (AZ). Each AZ runs on its own physically distinct, independent infrastructure, and is engineered to be highly reliable. In case of an infrastructure failure, Amazon RDS performs an automatic failover to the standby (or to a read replica in the case of Amazon Aurora), so that you can resume database operations as soon as the failover is complete. Since the endpoint for your DB Instance remains the same after a failover, your application can resume database operation without the need for manual administrative intervention.
For more information on AWS RDS Multi-AZ, please visit the following URL:
https://aws.amazon.com/rds/details/multi-az/
