ORACLE查询系统中阻塞情况~

//SCOTT窗口1

SQL> select * from t2;

ID
----------
3
1
2

SQL> update t2 set id=12 where id=2;

1 row updated.

SQL>

//SCOTT窗口2

SQL> select * from t2;

ID
----------
3
1
2

SQL> update t2 set id=11 where id=3;

已更新 1 行。

SQL> update t2 set id=13 where id=2;
//此时进入等待……卡住不动了

//SYS窗口

SQL> select c.terminal||' ('''||a.sid||','||c.serial#||''') is blocking '||b.sid
||','||d.serial# block_msg, a.block
2  from v$lock a,v$lock b,v$session c,v$session d
3  where a.id1=b.id1
4    and a.id2=b.id2
5    and a.block>0
6    and a.sid <>b.sid
7    and a.sid=c.sid
8    and b.sid=d.SID
9  ;

BLOCK_MSG                                     BLOCK
---------------------------------------- ----------
HWANG ('138,305') is blocking 153,15              1

SQL> select sid,serial#,username from v$session where username is not null;

SID    SERIAL# USERNAME
---------- ---------- ------------------------------
136        179 SYS
138        305 SCOTT
153         15 SCOTT

//这个时候可以杀掉那个BLOCKER

SQL> alter system kill session'138,305';

System altered.

//SCOTT窗口1

SQL> select * from t2;
select * from t2
*
ERROR at line 1:
ORA-00028: your session has been killed

SQL>