Oracle Notification Service Servers

Understand how Oracle Notification Service servers deliver load balancing and high availability event notifications in a Global Data Services environment.

GDS clients use Oracle Notification Service (ONS) to receive run-time load balancing advisory and high availability events from global service managers.

An ONS server is co-located with each global service manager. All such ONS servers within a region are interconnected. Clients of global services subscribe to the ONS server network within their region and their buddy region, and receive FAN notifications from those ONS server networks.

Note:

An Oracle Real Application Clusters (Oracle RAC) database in a Global Data Serviced configuration can also contain ONS servers running on the cluster nodes. These ONS servers generate Fast Application Notification (FAN) events related to local services and do not connect to ONS server networks in the GDS regions.

Parent topic: Global Data Services Components