查ORACLE 锁表

查询发生死锁的select语句

select sql_text
from v$sql
where hash_value in (

select sql_hash_value
from v$session
where sid in (select session_id from v$locked_object))

--首先查看有哪些锁
select /*+ rule */ s.username,
decode(l.type,'TM','TABLE LOCK','TX','ROW LOCK',null) lock_level,
o.owner,
o.object_name,
o.object_type,
s.sid,s.serial#,
s.terminal,
s.machine,
s.program,
s.osuser
from v$session s,v$lock l,dba_objects o
where l.sid = s.sid
and l.id1 = o.object_id(+)
and s.username is not null

--如果发生了锁等待，看是谁锁了表而引起谁的等待
--以下的语句可以查询到谁锁了表，而谁在等待。 如果有子节点，则表示有等待发生
select /*+ rule */ lpad(' ',decode(l.xidusn ,0,3,0))||l.oracle_username user_name,
o.owner,
o.object_name,
o.object_type,
s.sid,
s.serial#
from v$locked_object l,dba_objects o,v$session s
where l.object_id=o.object_id
and l.session_id=s.sid
order by o.object_id,xidusn desc


--找到引起等待的session,杀掉该session:
alter system kill session 'sid,serial#';