今天在进行测试环境导数据的时候，需要记性drop user操作。在执行drop user的时候，提示：ORA-01940: cannot drop a user that is currently connected

SQL> drop user ecity ;

drop user ecity

*

ERROR at line 1:

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

问题很明显，有用户在连接，不允许drop掉该user。

select username,sid,serial#,paddr from v$session where username='ECITY';

USERNAME                                    SID    SERIAL# PADDR

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

ECITY                                              634          7 00000000C028D198

SQL> select PROGRAM from v$process where addr='00000000C028D198';

PROGRAM

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

Oracle@oradb01 (DW00)

SQL>

SQL> alter system kill session '634,7';

System altered.

SQL>

SQL> select saddr,sid,serial#,paddr,username,status from v$session where username is not null;

SQL> drop user ecity CASCADE;

User dropped.

SQL>

问题解决，记得KILL进程前，先看看是啥进程，哪台机连过来的，能否KILL等等。测试环境还好，生产无小事。