Amazon RDS Multi-AZ Deployments
Multi-AZ (Availability Zone) deployments are used to improve the availability and fault tolerance of Amazon RDS databases. They implement synchronous replication of a database instance to a standby instance in another Availability Zone within the same region. During failover, RDS will automatically switch to the standby instance, minimizing downtime. Multi-AZ deployments are suitable for critical applications, helping to achieve better reliability, data durability, and protection against database failures and planned maintenance events like backups, patches, and instance scaling.
Guide on Amazon RDS Multi-AZ Deployments
Amazon RDS Multi-AZ deployments provide enhanced availability and durability for Database (DB) Instances, thus making them a suitable solution for production workloads.
What is Amazon RDS Multi-AZ Deployments?
Amazon RDS Multi-AZ deployments are meant to provide enhanced availability and durability for RDS database instances. In a Multi-AZ deployment, Amazon RDS automatically provisions and maintains a standby replica of the primary DB instance in a different Availability Zone. The primary DB instance is synchronously replicated to the standby instance.
How does it work?
Once the multi-AZ deployment is chosen, Amazon RDS automatically undertakes a number of tasks which include replication, failover support, backups, patching and software updates. In the event of a planned or unplanned outage, Multi-AZ deployments automatically failover to the standby so that the DB operations can continue.
Exam Tips: Answering Questions on Amazon RDS Multi-AZ Deployments
1. Understand the Characteristics: Knowing the functionality of the Multi-AZ deployments is vital for any related question. Keep in mind that automated backups are taken from standby replicas, and the standby replica cannot be accessed directly.
2. Know the Benefits: Understand the benefits associated with choosing Multi-AZ deployments –high availability, automatic failover, and protection of latest database updates.
3. Understand the use-case: Use-cases are a critical part of the understanding. Multi-AZ deployments are essentially for production instances while Read Replicas are for read traffic offloading from primary instances.
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