How to use the Oracle Server Control (srvctl) to enable instances, and see configurations and statuses.

Enabling an Instance

# srvctl enable instance -d [unique database name] -i "[instance1],[instance2]"

Enables instances. If repeated, get messages,

PRCC-1011: [db] was already enabled on [server name 1], [server name 2]

PRCR-1002: Resource [resource name] is already enabled

See the Configuration of a Service

# srvctl config service -d [unique service name]

Provides service name and status, server pool, service role, failover type, preferred instances and available instances.

Change Which Instance is Preferred

# srvctl modify service -d [unique database name] -s [service name] -i [available instance] -r

-r is the command that says to move it from available to preferred.