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@faun ・ Apr 13,2023
Amazon RDS now allows the creation of 15 additional asynchronous read replicas outside the cluster in addition to the two readable standby instances in Multi-AZ deployments with two readable standbys.
This enables scaling up the read capacity to 17 instances, providing improved performance and durability for read-heavy database workloads. The read replicas can also be promoted and modified to be a Multi-AZ deployment option with two readable standbys when needed.
Furthermore, Multi-AZ deployments with two readable standby database instances have faster transaction commit latencies compared to Multi-AZ deployments with one standby instance, and automated failovers typically take under 35 seconds. The two readable standbys can also serve read traffic.
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