dbora and standby database in Data Guard configuration

 Hi,

I am learning to set up a physical standy database using Data Guard.  The standby database will be in mount mode allowing the Media recovery process to run.  Usually the dbora will start up the database in open mode.  In this case, I only need to change it to mound mode, right? 

When the switchover/faileover occurs, the standby database becomes the primary database.  I should update the dbora script according by starting up the databse back to open mode, right?   This seems to be very manually intensive.  Is there a better way to program the dbora scripts without human intervention during switchover/failover?