SQL> select group#, thread#, sequence#, status, archived from v$log;

GROUP# THREAD# SEQUENCE# STATUS ARC
---------- ---------- ---------- ---------------- ---
1 1 61 INACTIVE YES
2 1 62 INACTIVE YES
3 1 63 INACTIVE YES
4 1 64 CURRENT NO
5 2 36 INACTIVE YES
6 2 37 CURRENT NO

6 rows selected.
Now I try to drop group 5 and 6 but giving me error below..

SQL> alter database drop logfile group 5;
alter database drop logfile group 5
*
ERROR at line 1:
ORA-01567: dropping log 5 would leave less than 2 log files in thread 2
ORA-00312: online log 5 thread 2: '/parh/redo05.log'
Even I switch the logfiles
SQL> alter system switch logfile;

System altered.
I think it has to do with the THREAD#.

Any idea how can I drop it?

Thanks