How to drop an non-existing thread log group.
My database doesn't have thread 3; this has been added during cloning from 3 node to 2 node RAC.
alter database drop logfile group 10
*
ERROR at line 1:
ORA-01623: log 10 is current log for instance UNNAMED_INSTANCE_3 (thread 3) - cannot drop
ORA-00312: online log 10 thread 3: '+DATA/devdb/onlinelog/group_10.560.811225745'
ORA-00312: online log 10 thread 3: '+FLASHBACK/devdb/onlinelog/group_10.360.811225745'
GROUP# THREAD# seq# STATUS
10 3 1 ACTIVE
11 3 0 UNUSED