"USING CURRENT LOGFILE" will enable the real-time apply feature is enabled, apply services can apply redo data as it is received, without waiting for the current standby redo log file to be archived. This results in faster switchover and failover times because the standby redo log files have been applied already to the standby database by the time the failover or switchover begins.
IN 11.2, I am setting Active Data Guard. Does active data guard require command 2, or that is done automatically by Oracle when I have setup active data guard.
Ans) Yes,you need to use "USINg CURRENT LOGFILE"