如何在Oracle中查看表是否被锁

如何在Oracle中查看表是否被锁

–以下几个为相关表
SELECT * FROM v

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lock; SELECT * FROM v

lock;SELECT∗FROMvsqlarea;
SELECT * FROM v

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session; SELECT * FROM v

session;SELECT∗FROMvprocess ;
SELECT * FROM v

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locked_object; SELECT * FROM all_objects; SELECT * FROM v

lockedo​bject;SELECT∗FROMallo​bjects;SELECT∗FROMvsession_wait;

–查看被锁的表
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;

–查看哪个用户哪个进程造成的死锁
select b.username,b.sid,b.serial#,logon_time from v

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locked_object a,v

lockedo​bjecta,vsession b where a.session_id = b.sid order by b.logon_time;

–查看连接的进程
SELECT sid, serial#, username, osuser FROM v$session;

–3.查出锁定表的sid, serial#,os_user_name, machine_name, terminal，锁的type,mode
SELECT s.sid, s.serial#, s.username, s.schemaname, s.osuser, s.process, s.machine,
s.terminal, s.logon_time, l.type
FROM v

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session s, v

sessions,vlock l
WHERE s.sid = l.sid
AND s.username IS NOT NULL
ORDER BY sid;

这个语句将查找到数据库中所有的DML语句产生的锁，还可以发现，
任何DML语句其实产生了两个锁，一个是表锁，一个是行锁。

–杀掉进程 sid,serial#
alter system kill session’210,11562’;

总结：
解锁表：
1、下面的语句用来查询哪些对象被锁：
select object_name,machine,s.sid,s.serial#
from v

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locked_object l,dba_objects o ,v

lockedo​bjectl,dbao​bjectso,vsession s
where l.object_id　=　o.object_id and l.session_id=s.sid;

2、下面的语句用来杀死一个进程：
alter system kill session ‘24,111’; 
(其中24,111分别是上面查询出的sid,serial#)