SQL> drop user dzjc cascade;

drop user dzjc cascade

*

第 1 行出现错误:

ORA-01940: 无法删除当前已连接的用户

SQL> desc v$session;

名称                                      是否为空? 类型

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

SADDR                                              RAW(4)

SID                                                NUMBER

SERIAL#                                            NUMBER

AUDSID                                             NUMBER

PADDR                                              RAW(4)

USER#                                              NUMBER

USERNAME                                           VARCHAR2(30)

COMMAND                                            NUMBER

OWNERID                                            NUMBER

TADDR                                              VARCHAR2(8)

LOCKWAIT                                           VARCHAR2(8)

STATUS                                             VARCHAR2(8)

SERVER                                             VARCHAR2(9)

SCHEMA#                                            NUMBER

SCHEMANAME                                         VARCHAR2(30)

SQL> select username,sid,serial# from v$session;

USERNAME                              SID    SERIAL#

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

SYS                                   143         59

147          1

148          1

149          1

SYS                                   154         58

155          3

156          3

DZJC                                  158          7

160          1

161          1

162          1

SQL> alter system kill session'158,7';

系统已更改。

SQL> drop user dzjc cascade;

用户已删除。

SQL>