# 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.<br>
* 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**.<br>
* 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.<br>
* **Failover times are typically 60–120 seconds**.<br>
* 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.<br>
* The high-availability feature is **not a scaling solution for read-only scenarios**; you cannot use a standby replica to serve read traffic.