oracle中用户删除不了，提示“无法删除当前已连接的用户”
1.alter user XXX account lock;SELECT * FROM V$SESSION WHERE USERNAME='LGDB'；alter system kill session 'xx,xx'drop user xx cascade

2.或者shutdown掉数据库，再重启

具体可如下：

(1)查看用户的连接状况

select username,sid,serial# from v$session

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

如下结果：



username          sid                serial#

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

NETBNEW          513              22974
NETBNEW          514              18183
NETBNEW          516              21573
NETBNEW          531              9
WUZHQ             532              4562

(2)找到要删除用户的sid,和serial，并删除

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

如：你要删除用户'WUZHQ',可以这样做：



alter system kill session'532,4562'



(3)删除用户

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

drop user username cascade



(**)如果在drop 后还提示ORA-01940:无法删除当前已链接的用户，说明还有连接的session，可以通过查看session的状态来确定该session是否被kill 了，用如下语句查看：

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

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

结果如下(以我的库为例)：

saddr                     sid           serial#            paddr              username              status

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

564A1E28              513           22974            569638F4        NETBNEW             ACTIVE
564A30DC              514          18183            569688CC        NETBNEW            INACTIVE
564A5644              516           21573            56963340        NETBNEW            INACTIVE
564B6ED0              531           9                   56962D8C        NETBNEW   &