If you configure a preferred instance for a service, but do not specify at least one available instance for the service, then the service does not failover to another instance if the preferred instance fails.

Aug 21, 2025 · If for any reason the preferred instance fails, or the entire node becomes unavailable, the service will be moved to the available instance. Even after restarting the preferred instance, the …

Apr 18, 2023 · Introduction To use High Availability features like Fast Application Notification (FAN), Draining, and Application Continuity, you need to create a custom database service and set the high …

When you create services in RAC, you can assign the services to instances for preferred (normal) and available (recovery) processing. You can identify other instances that are available to support the …

Aug 21, 2025 · As you know, in a RAC environment when creating a service, you can define preferred instances and available instances. In this case, the service will by default run on the preferred...

Sep 28, 2018 · In this article I would explain how we create a service and make it run on the instance (s) of our choice, and make it automatically failover to another instance/node if current instance node …

Sep 17, 2019 · The service is running on the desired number of instances. Maintaining the service on the current instance provides a higher level of service availability. Not moving the service back to the …

May 29, 2019 · High-availability of database services has been a feature of Oracle Real Application Servers since many versions. Bascially, when a database instance fails, a service which has got this …

A service may be configured to direct connections to a single preferred instance, or alternatively, if the preferred instance is down, to an available instance.

Mar 5, 2018 · Here I have created service named myservice with preferred instance orcl1 and available instance orcl2. To check all available parameters of service creation : Adds a service configuration to …