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
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#)