AWS Solutions Architect Associate Practice Test

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What characteristic defines a Multi-AZ deployment in RDS?

Replication to another geographical region
Data is replicated across Availability Zones
Enables failover only for read replicas
Choice of SQL or NoSQL databases

The correct answer is: Data is replicated across Availability Zones

A Multi-AZ deployment in Amazon RDS (Relational Database Service) is characterized by the replication of data across multiple Availability Zones (AZs) within the same AWS region. In this setup, Amazon RDS creates a primary database instance and a synchronous standby replica in a different AZ. This configuration enhances availability and durability, as automatic failover occurs in the event of an issue with the primary instance, ensuring minimal downtime for applications. The primary advantage of this architecture is that it offers high availability for the database. The standby instance can take over seamlessly if the primary instance fails, without requiring manual intervention. The data replication is synchronous, meaning that changes are written to both the primary and standby instances simultaneously, guaranteeing that the standby instance is always up to date with the latest data. This characteristic sets Multi-AZ deployments apart from other configurations like read replicas, which are intended for scaling read workloads rather than providing high availability through failover mechanisms. Additionally, Multi-AZ deployments focus solely on the same database engine, whether SQL or NoSQL, and do not enable choosing between database types as an essential characteristic.