GSM-45598
If -service is not specified, all global services of GDS pool will be stopped. If -database is not specified, the global services will be stopped on all databases.
If -force is specified, all sessions will be disconnected requiring the session using the global service to reconnect (potentially to another instance).
If -force is specified, all sessions will be disconnected requiring the session using the global service to reconnect (potentially to another instance).
Cause
GDSCTL help message.