Hi

1) Manually apply the redo to the standby database.

sqlplus "/ as sysdba"
SQL> recover standby database;

Specify log: {=suggested | filename | AUTO | CANCEL}
/oracle/dbvisitp/redo01.dbf <-- Type name of redo log

oracle will complain if they are out of order ,then start trying the other redo logs

But highley unlikey you cna do this in case of disaster and failover situatutions as failover means something like your primary server gor burnt and is no longer available.

regards
Hrishy