*** 2011-05-15 13:08:04.287
ARC0: Archiving not possible: error count
exceeded
ORA-16038: log 4 sequence# 355460 cannot be
archived
ORA-00354: corrupt redo log block header
ORA-00312: online log 4 thread 1:
'/usr4/oraredo4/apvm1/redo04a.log'
ORA-00312: online log 4 thread 1:
'/redo4/oradata/apvm1/redo04b.log'
*** 2011-05-15 13:08:07.058
Here logfile group 4 is having issue
alter database clear unarchived logfile
group 4;
alter system switch logfile;