Last updated on AUGUST 15, 2016
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 and later
Information in this document applies to any platform.
This Article is intended to outline installation and configuration of Global Data Services (GDS) in a replicated environment like Data Guard and Oracle Golden Gate.It also covers GLOBAL_SERVICES with ROLE_BASED for Data guard and Load balancing for Oracle Golden Gate. In Load Balancing with clbgoal (connection load balancing) LONG and SHORT is for applications with long and short lived connections respectively.
Use GDSCTL>help or GDSCTL>command help.
GDSCTL>add service help
GDS CATALOG: It is a repository that stores configuration data of GDS. Catalog Database version must be 12c or later version.
Global Service Manager (GSM): A global service manager is the central software component of Global Data Services, providing service-level load balancing, failover and centralized management of services in GDS.
Global Services: For outside Client GDS configuration is represented as set of Global Service. GSM is aware of all the global service in the GDS configuration. It acts as a mediator for the database clients and databases in the configuration.
Role of GSM
-> Acts as a regional Listener that clients use to connect to GLOBAL services.
-> Provide connect time load balancing.
-> Creates run time load balancing advisory and publish it to all the clients.
-> Monitors the availability of database instance and global services and notifies clients upon failure.
-> Depends on database performance metrics it calculates the network latency between the region with the GDS configuration.
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