Enable or disable Database or instance Using SRVCTL RAC
Syntax for Enable Instance using SRVCTL
srvctl enable instance -d DB_UNIQUE_NAME-i INSTANCE_NAME
Syntax for Disable Instance using SRVCTL
srvctl disable instance -d DB_UNIQUE_NAME-i INSTANCE_NAME
Syntax for Enable Database using SRVCTL
srvctl enable database -d DB_UNIQUE_NAME
Syntax for Disable Database using SRVCTL
srvctl disable database -d DB_UNIQUE_NAME