oracle 删除用户，提示“无法删除当前已连接的用户”

1. 首先查询出该用户的登录情况，注意用户名必须是大写

SQL> select username,sid,serial# from v$session where username = 'XSTRMADMIN';

USERNAME                              SID    SERIAL#

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

SYS                                   136        530

SYS                                   137        328

SYSMAN                                138         12

UTEST                                 139       1098

SYSMAN                                140         12

                                      142         40

SYSMAN                                143         52

SYS                                   144       1023

SYS                                   148       2634

                                      152          4

                                      154          1

SYS                                   158        280

2. 指定需删除的 SID和SERIAL#，然后删除连接

SQL> alter system kill session '139,1098';

3. 删除用户

drop user XSTRMADMIN cascade;