会话1：
SQL> conn scott/scott
Connected.
SQL>
SQL>
SQL> update emp set empno=5566 where empno=7788;
1 row updated.
SQL>
会话2
SQL> show user
USER is "SYS"
SQL> update scott.emp set empno=3344 where empno=7788;
会话2因为会话1没有提交，造成等待事件。
会话3
SQL> select saddr,sid,serial#,paddr,username,status from v$session where username =upper('scott') or username =upper('sys');
SADDR SID SERIAL# PADDR
---------------- ---------- ---------- ----------------
USERNAME STATUS
------------------------------ --------
000000008E04BD60 1 7 000000008E498608
SCOTT INACTIVE
000000008E7EC578 17 85 000000008E4A8058
SYS ACTIVE
000000008E78A0D0 50 37 000000008E4A4E48
SYS ACTIVE
SQL> set linesize 200
SQL> /
SQL> select saddr,sid,serial#,paddr,username,status from v$session where username =upper('scott') or username =upper('sys');
SADDR SID SERIAL# PADDR USERNAME STATUS
---------------- ---------- ---------- ---------------- ------------------------------ --------
000000008E04BD60 1 15 000000008E498608 SCOTT INACTIVE
000000008E7EC578 17 85 000000008E4A8058 SYS ACTIVE
000000008E78A0D0 50 55 000000008E4A4E48 SYS ACTIVE
SQL> alter system kill session '1,15';
System altered.
kill掉会话1后，会话2的语句就提交了。
SQL> update scott.emp set empno=3344 where empno=5566;
1 row updated.
在会话1执行命令会报如下的错误
SQL> update scott.emp set empno=7777 where empno=5566;
update scott.emp set empno=7777 where empno=5566
*
ERROR at line 1:
ORA-00028: your session has been killed
会话3查询会话状态
select saddr,sid,serial#,paddr,username,status from v$session where username =upper('scott') or username =upper('sys');
SADDR SID SERIAL# PADDR USERNAME STATUS
---------------- ---------- ---------- ---------------- ------------------------------ --------
000000008E7EC578 17 85 000000008E4A8058 SYS &nbs