RDS Multi AZ

  • RDS Multi-AZ deployments provide enhanced availability and durability for RDS database 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 AZ.

  • 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).

    • You can resume database operations as soon as the failover is complete.

  • Failover times are typically 60–120 seconds.

  • The time it takes for the failover to complete depends on the database activity and other conditions at the time the primary DB instance became unavailable.

  • The high-availability feature is not a scaling solution for read-only scenarios; you cannot use a standby replica to serve read traffic.

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