New feature in Oracle 12C - Data Guard

       Data Guard -

Oracle Database 12c introduces a new redo transportation method which omits the acknowledgement (to primary) of the transaction on the standby. This feature is called "Fast Sync" redo transport.

Creating a new type of redo destination called "Far Sync Standby". 

A "Far Sync Standby" is composed only of the standby control files, the standby redo logs and some disk space for archive logs which shall be sent to the Standby database. Failover & Switchover operations are totally transparent as the "Far Sync Standby" cannot be used as the target.

Data Guard Broker commands have been extended. The "validate database" command to checks whether the database is ready for role transition or not.

Data guard Broker now supports cascaded standby.

      Global Temporary Tables can now be used on an Active Guard standby database.