Overview of Switchover and Failover in a DG PDB Environment

Oracle Data Guard broker enables you to reverse the roles of the source PDB and its designated target PDB using either a switchover or failover operation.

• PDB switchover

  A planned role reversal between a source PDB and its designated target PDB. The broker ensures that the target PDB has applied all the redo generated by the source PDB before switching roles.

  As part of managing a switchover, the broker automatically sets up redo transport from the new source PDB to its designated target PDB and starts redo apply services on the new target PDB.

• PDB failover

  A role transition in which a designated target PDB is transitioned to the source PDB role after the source PDB has failed or has become unreachable. It is recommended that you perform a failover only when the source PDB is unavailable.