{ ACTIVATE [PHYSICAL | LOGICAL] STANDBY DATABASE [SKIP [STANDBY LOGFILE]
| SET STANDBY DATABASE TO MAXIMIZE
    {PROTECTION | AVAILABILITY | PERFORMANCE}
| REGISTER [OR REPLACE] [PHYSICAL | LOGICAL] LOGFILE 
                    [redo_log_file_spec [, redo_log_file_spec]...]
| commit_switchover_clause
| START LOGICAL STANDBY APPLY 
     {NEW PRIMARY dblink | INITIAL [scn_value]}
| {STOP | ABORT} LOGICAL STANDBY APPLY
} 
[parallel_clause]