如何在Oracle中查看表是否被锁

如何在Oracle��查看表是否被锁

–以下几个为相关表

SELECT * FROM v l o c k ; S E L E C T ∗ F R O M v lock; SELECT * FROM v lock;SELECT∗FROMvsqlarea;

SELECT * FROM v s e s s i o n ; S E L E C T ∗ F R O M v session; SELECT * FROM v session;SELECT∗FROMvprocess ;

SELECT * FROM v l o c k e d o b j e c t ; S E L E C T ∗ F R O M a l l o b j e c t s ; S E L E C T ∗ F R O M v 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***锁

select b.username,b.sid,b.serial#,logon_time from v l o c k e d o b j e c t a , v 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 s e s s i o n s , v 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 l o c k e d o b j e c t l , d b a o b j e c t s o , v 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***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#)