Refresh the physical standby Oracle Database with the changes made to the primary Oracle Database, and then switch roles.

• Steps to Refresh a Physical Standby Database with Changes Made to the Primary Database
  Use the RECOVER STANDBY DATABASE command with the FROM SERVICE clause to refresh a physical standby database with changes that were made to the primary database.
• Performing a Switchover to a Physical Standby Database
  These steps describe how to perform a switchover to a physical standby database.