ORA-15260: permission denied on ASM disk group

SQL> conn / as sysdba 
Connected. 

SQL> drop diskgroup fravol01;

drop diskgroup fravol01
*
ERROR at line 1:

ORA-15260: permission denied on ASM disk group

原因：

SYSDBA privilege不允许进行ASM操作。

解决：

SQL> conn / as sysasm
Connected.
SQL> alter diskgroup fra dismount;
Diskgroup altered.