ORA-01940: cannot drop a user that is currently...

ERROR：ORA-01940: cannot drop a user that is currently connected

因为当前用户正链接到数据库，因此没法删除

解决办法：

一、查询此用户的会话进程，

SQL> SELECT SID,SERIAL#,USERNAME FROM V$SESSION WHERE USERNAME='USER1';

       SID    SERIAL#

---------- ----------

        24      25341

        86      18117

二、结束此用户的全部会话

SQL> ALTER SYSTEM KILL SESSION '24,25341';

System altered.

SQL> ALTER SYSTEM KILL SESSION '86,18117';

System altered.

三、删除用户

SQL> DROP USER USER1 CASCADE；