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why dataguard real time apply has transport lag and apply lag?

The standby database use real time apply by default in oracle rdbms version 12c, but the v$dataguard_stats shows minutes or hours of lagging on transport and apply, v$managed_standby shows the MRP0 block#=0, means it's not doing the real time apply. The standby logs are all active and not being archived.









The root cause of this problem is the archive_dest_1 (or 2) specified "valid_for=(all_roles, online_logfile), it should be "all_logfiles".









 After fixing this parameter and switch logfile, real time apply is working ok, archive logs are being generated correctly, only one standby logs status remain "active".
 



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