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Oracle 12c-Step by Step Manual Switchover Data Guard Switchover Operation Procedure: After configuring data guard, databases would be either primary and Oracle Database 12c Release 1 (12.1) introduces new SQL syntax for performing switchover and failover operations to a physical standby database.Now need to check archive sequence applied in standby database. Because Physical Standby database needs to synchronize with primary database. Disable log You can, however, perform a manual failover to a snapshot standby. (ONS) for all Oracle integrated database clients in Oracle Database 12c and later.