It is a new feature introduced in oracle 12C to ensure that applications are minimally impacted in the event of a database instance failure.
This new feature masks recoverable outages from end-users and applications by replaying the database request at another RAC database instance (for RAC) or another database for standby database.
It is designed to preserve the commit outcome and ensure application continuity for both planned and unplanned downtime.
meda Changed status to publish 15/07/2022