如果发生了锁等待，我们可能更想知道是谁锁了表而引起谁的等待
以下的语句可以查询到谁锁了表:
代码如下：

SELECT /*+ rule */ s.username,
decode(l.type,'TM','TABLE LOCK',
'TX','ROW LOCK',
NULL) LOCK_LEVEL,
o.owner,o.object_name,o.object_type,
s.sid,s.serial#,s.terminal,s.machine,s.program,s.osuser
FROM v$session s,v$lock l,dba_objects o
WHERE l.sid = s.sid
AND l.id1 = o.object_id(+)
AND s.username is NOT NULL

以下的语句可以查询到谁在等待:
代码如下：

SELECT /*+ rule */ 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

解锁命令:
代码如下：

alter system kill session 'sid,serial#'

1).
代码如下：

select LOCK_INFO.OWNER || '.' || LOCK_INFO.OBJ_NAME as "已物件名", --物件名(已被住)
LOCK_INFO.SUBOBJ_NAME as "已子物件名", -- 子物件名(已被住)
SESS_INFO.MACHINE as "器名", -- 器名
LOCK_INFO.SESSION_ID as "ID", -- SESSION_ID
SESS_INFO.SERIAL# as "SERIAL#", -- SERIAL#
SESS_INFO.SPID as "OS系的SPID", -- OS系的SPID
(SELECT INSTANCE_NAME FROM V$INSTANCE) "例名SID", --例名SID
LOCK_INFO.ORA_USERNAME as "ORACLE用", -- ORACLE系用名
LOCK_INFO.OS_USERNAME as "OS用", -- 作系用名
LOCK_INFO.PROCESS as "程", -- 程
LOCK_INFO.OBJ_ID as "象ID", -- 象ID
LOCK_INFO.OBJ_TYPE as "象型", -- 象型
SESS_INFO.LOGON_TIME as "登", -- 登
SESS_INFO.PROGRAM as "程式名", -- 程式名
SESS_INFO.STATUS as "", --
SESS_INFO.LOCKWAIT as "等待", -- 等待
SESS_INFO.ACTION as "作", -- 作
SESS_INFO.CLIENT_INFO as "客" -- 客
from (select obj.OWNER as OWNER,
obj.OBJECT_NAME as OBJ_NAME,
obj.SUBOBJECT_NAME as SUBOBJ_NAME,
obj.OBJECT_ID as OBJ_ID,
obj.OBJECT_TYPE as OBJ_TYPE,
lock_obj.SESSION_ID as SESSION_ID,
lock_obj.ORACLE_USERNAME as ORA_USERNAME,
lock_obj.OS_USER_NAME as OS_USERNAME,
lock_obj.PROCESS as PROCESS
from (select *
from all_objects
where object_id in (select object_id from v$locked_object)) obj,
v$locked_object lock_obj
where obj.object_id = lock_obj.object_id) LOCK_INFO,
(select SID,
SERIAL#,
LOCKWAIT,
STATUS,
(select spid from v$process where addr = a.paddr) spid,
PROGRAM,
ACTION,
CLIENT_INFO,
LOGON_TIME,
MACHINE
from v$session a) SESS_INFO
where LOCK_INFO.SESSION_ID = SESS_INFO.SID
order by LOCK_INFO.SESSION_ID;

2).
代码如下：

select sql_text
from v$sqltext
where address in (select sql_address from v$session where sid = &sid)
order by piece;

3).
代码如下：

ALTER SYSTEM KILL SESSION 'ID,SERIAL#';

4).
kill -9 OS系的SPID