Learn how Amazon RDS Multi-AZ deployment automatically creates a primary database instance and synchronously replicates data to another Availability Zone for enhanced fault tolerance and high availability.
Table of Contents
Question
Which feature of Amazon RDS provides the ability to automatically create a primary database instance and to synchronously replicate data to an instance in another Availability Zone?
A. Read replicas
B. Blue/green deployment
C. Multi-AZ deployment
D. Reserved Instances
Answer
C. Multi-AZ deployment
Explanation
Amazon RDS Multi-AZ deployment is a feature that automatically creates a primary database instance and synchronously replicates data to a standby instance in a different Availability Zone within the same region. This provides enhanced fault tolerance, high availability, and automatic failover in the event of an infrastructure failure or maintenance.
Here’s how Multi-AZ deployment works:
- When you enable Multi-AZ for your database instance, Amazon RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone.
- The primary database instance is synchronously replicated to the standby replica, ensuring that the standby has an up-to-date copy of the data.
- If the primary instance becomes unavailable due to an infrastructure failure or maintenance, Amazon RDS automatically fails over to the standby instance, promoting it to be the new primary. This failover process typically takes about 60-120 seconds.
- During the failover, the database endpoint remains the same, so your application can continue to access the database without any changes to the connection string.
Multi-AZ deployment is different from read replicas (option A), which are used to scale read traffic and don’t provide automatic failover. Blue/green deployment (option B) is a deployment strategy for updating applications, not a feature of Amazon RDS. Reserved Instances (option D) are a billing option that allows you to reserve database capacity at a discounted rate, but they don’t provide automatic replication or failover.
In summary, Amazon RDS Multi-AZ deployment automatically creates a primary database instance and synchronously replicates data to a standby instance in another Availability Zone, providing high availability and automatic failover in case of failures or maintenance events.
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