Global Services

Oracle RAC supports database services and enables service-level workload management across instances in a single cluster.

Global services provide dynamic load balancing, failover, and centralized service management for a set of replicated databases that offer common services. The set of databases may include Oracle RAC and non-clustered Oracle AI Databases interconnected by Oracle Data Guard, Oracle GoldenGate, or any other replication technology.

When you create and use global services, the following workload management features are available:

Ability to specify preferred and available databases for a global service
Handling of replication lag
Geographical affinity between clients and servers
Connection load balancing
Run-time load balancing
Inter-database service failover
Fast connection failover
Connect-time failover
Application Continuity
Transaction Guard
Backward compatibility with existing clients

Note:

You can manage instance placement of a global service within an Oracle RAC database with SRVCTL but you can only manage other global service attributes with GDSCTL.