Oracle锁的相关脚本
1锁表解除
select s.sid,
s.serial#,
do.object_name,
l.oracle_username,
s.machine,
l.os_user_name,
l.locked_mode
from v$locked_object l, dba_objects do, v$session s
where do.object_id = l.object_id
and s.sid = l.session_id;
-- alter system kill session 'sid,#serial';
2查找未加索引的外键(可能导致死锁)
select table_name,
constraint_name,
cname1 || nvl2(cname2, ',' || cname2, null) ||
nvl2(cname3, ',' || cname3, null) ||
nvl2(cname4, ',' || cname4, null) ||
nvl2(cname5, ',' || cname5, null) ||
nvl2(cname6, ',' || cname6, null) ||
nvl2(cname7, ',' || cname7, null) ||
nvl2(cname8, ',' || cname8, null) columns
from (select b.table_name,
b.constraint_name,
max(decode(position, 1, column_name, null)) cname1,
max(decode(position, 2, column_name, null)) cname2,
max(decode(position, 3, column_name, null)) cname3,
max(decode(position, 4, column_name, null)) cname4,
max(decode(position, 5, column_name, null)) cname5,
max(decode(position, 6, column_name, null)) cname6,
max(decode(position, 7, column_name, null)) cname7,
max(decode(position, 8, column_name, null)) cname8,
count(*) col_cnt
from (select substr(table_name, 1, 30) table_name,
substr(constraint_name, 1, 30) constraint_name,
substr(column_name, 1, 30) column_name,
position
from user_cons_columns) a,
user_constraints b
where a.constraint_name = b.constraint_name
and b.constraint_type = 'R'
group by b.table_name, b.constraint_name) cons
where col_cnt > all
(select count(*)
from user_ind_columns i
where i.table_name = cons.table_name
and i.column_name in (cname1, cname2, cname3, cname4, cname5,
cname6, cname7, cname8)
and i.column_position <= cons.col_cnt
group by i.index_name)
3查看造成阻塞与被阻塞的锁
select (select username from v$session where sid = a.sid) blocker,
a.sid,
' is blocking ',
(select username from v$session where sid = b.sid) blockee,
b.sid
from v$lock a, v$lock b
where a.block = 1
and b.request > 0
and a.id1 = b.id1
and a.id2 = b.id2;
4查看锁的状态
select username,
v$lock.sid,
trunc(id1 / power(2, 16)) rbs,
bitand(id1, to_number('ffff', 'xxxx')) + 0 slot,
id2 seq,
lmode,
request
from v$lock, v$session
where v$lock.type = 'TX'
and v$lock.sid = v$session.sid
and v$session.username = 'TEST';
5查看TM锁中锁定的对象
-- TM锁的v$lock视图中字段ID1列就是DML锁定对象的对象ID
select (select username from v$session where sid = l.sid) username,
u.object_name,
l.sid,
l.type
from v$lock l, user_objects u
where sid = (select sid from v$mystat where rownum = 1)
and l.type = 'TM'
and l.id1 = u.object_id;