Multi-AZ roadmap for RDS Custom for Oracle
Are there any upcoming plans to support Multi-AZ deployments in RDS Custom for Oracle?
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Hi,
As highlighted by the re:post AI agent, Amazon RDS Custom for Oracle does not support Multi-AZ deployments at this time as mentioned in the public AWS Documentation. While AWS continuously evaluates service enhancements based on customer feedback, the Multi-AZ feature may available sometime in future, but unable to provide any timelines for this feature.
As mentioned, you can use read replicas to build a high availability solution with both synchronous and asynchronous data replication options.
Similar to on-perm oracle database environment, you can use the Oracle database feature of Fast-Start Failover (FSFO) for automated failure detection in primary and failover to read replica as an alternative to Multi-AZ. You would need Oracle Enterprise Edition with Active Data Guard option license.
Below blog post explains the steps in detail on how to configure FSFO in RDS Custom for Oracle Configure Fast-Start Failover.
Currently, Amazon RDS Custom for Oracle does not support Multi-AZ deployments. There are no publicly announced plans or roadmap items indicating that Multi-AZ support will be added to RDS Custom for Oracle in the near future.
However, it's important to note that while RDS Custom for Oracle doesn't offer native Multi-AZ support, there are alternative ways to achieve high availability:
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You can use read replicas to manually build a high availability (HA) solution. This approach allows for both synchronous and asynchronous data replication, depending on your specific design requirements.
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RDS Custom for Oracle supports up to five managed read replicas, which can be created automatically through the AWS Management Console or AWS CLI.
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You have the flexibility to create manually configured external Oracle replicas. These can be hosted on Amazon EC2 instances in the same or another AWS Region, or even in an on-premises environment.
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External replicas don't count toward the instance limit within your AWS account and are outside the RDS Custom support perimeter.
While these options don't provide the same automatic failover capabilities as a true Multi-AZ deployment, they do offer ways to implement high availability and disaster recovery solutions for RDS Custom for Oracle databases.
If Multi-AZ deployment is a critical requirement for your Oracle database workloads, you might want to consider using standard Amazon RDS for Oracle, which does support Multi-AZ deployments with automatic failover during planned maintenance and unplanned disruptions.
Sources
High availability - AWS Prescriptive Guidance
Multi-AZ DB instance deployments for Amazon RDS - Amazon Relational Database Service
Amazon Relational Database Service Custom (Amazon RDS Custom) for Oracle now supports Multi-AZ deployments
https://aws.amazon.com/about-aws/whats-new/2025/07/amazon-relational-database-service-custom-az-deployments/ https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/custom-oracle-multiaz.html
Documentation : https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/custom-oracle-multiaz.html