- SQL> drop user test cascade;
- drop user test cascade
- *
- ERROR at line 1:
- ORA-01940: cannot drop a user that is currently connected
- SQL> select username,sid,serial# from v$session;
- USERNAME SID SERIAL#
- ------------------------------ ---------- ----------
- SYSMAN 118 43411
- test 122 483
- test 123 391
- SYS 125 626
- DBSNMP 129 48
- SYSMAN 130 247
- DBSNMP 136 113
- SYSMAN 138 15
- SYSMAN 141 3
- 143 50435
- 152 3
- USERNAME SID SERIAL#
- ------------------------------ ---------- ----------
- 153 3
- SYSMAN 158 15
- 160 1
- 161 1
- 162 1
- 163 1
- 164 1
- 165 1
- 166 1
- 167 1
- 168 1
- USERNAME SID SERIAL#
- ------------------------------ ---------- ----------
- 169 1
- 170 1
- SQL>alter system kill session '122,483';
- SQL> drop user test cascade;
-
(**)如果在drop 后还提示ORA-01940:无法删除当前已链接的用户，说明还有连接的session，可以通过查看session的状态来确定该session是否被kill 了，用如下语句查看：
-------------------------------------
select saddr,sid,serial#,paddr,username,status from v$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 INACTIVE
564B8184 532 4562 56A1075C WUZHQ KILLEDstatus 为要删除用户的session状态，如果还为inactive，说明没有被kill掉，如果状态为killed，说明已kill。
由此可见，WUZHQ这个用户的session已经被杀死。此时可以安全删除用户。
- User dropped.
