1、檢視資料庫鎖,診斷鎖的來源及類型： select object_id,session_id,locked_mode from
v$locked_object; 或者用以下指令：
select b.owner,b.object_name,l.session_id,l.locked_mode from v$locked_object
l, dba_objects b where b.object_id=l.object_id
SELECT lpad(‘
‘,decode(l.xidusn ,0,3,0))||l.oracle_username User_name,
o.owner,o.object_name,o.object_type,s.sid,s.serial# FROM v$locked_object
l,dba_objects o,v$session s WHERE l.object_id=o.object_id AND
l.session_id=s.sid ORDER BY o.object_id,xidusn DESC
2、找出資料庫的serial#,以備殺死：
select t2.username,t2.sid,t2.serial#,t2.logon_time from v$locked_object
t1,v$session t2 where t1.session_id=t2.sid order by
t2.logon_time;
3、殺死該session
alter system kill session ‘sid,serial#‘
用步驟2中查出來的記錄，對應進該語句删除
原文：http://www.cnblogs.com/huchaoheng/p/hengc.html