今天又学会一招，查看Oracle数据库中由于会话非正常退出而导致的事务锁：

1.查看锁住的表

SELECT b.owner,b.object_name,a.session_id,a.locked_mode 
    FROM v$locked_object a ,dba_objects b 
    WHERE b.object_id = a.object_id;

2.查看被锁住的会话

SELECT b.username,b.sid,b.serial#,logon_time 
    FROM v$locked_object a,v$session b 
    WHERE a.session_id = b.sid order by b.logon_time; 

3.如果要断开某个会话，执行

Alter system kill session ‘sid,serial#’

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