如何在Oracle中查看表是否被锁

刺骨的言语ヽ痛彻心扉 2023-10-04 22:21 46阅读 0赞

如何在Oracle中查看表是否被锁

–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 lockedobject;SELECT∗FROMallobjects;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 l o c k e d o b j e c t a , v locked\_object a,v lockedobjecta,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 lockedobjectl,dbaobjectso,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\#)