Oracle 解锁表
今天把DataStage导一个大表,一不小心把表给锁住了........
其实解锁并不复杂,用PL/SQL可以很方便解锁,可以用两种方式得到目前被锁住的表。第一种是,直接从,Tools->Session里面查看,里面有很多的Session和进程,下面有一个Lock的Tab,选中那个Tab,然后一条一条地去上面Session,如果Lock这一栏有数据,就说明被锁住了,在Objec_Name里面可以看到表名。
如果是自己的表,可以得到Sid和Serial#,接着执行以下语句就可以解锁:
alter system kill session 'sid,serial#';
第二种方法是用语句得到详细的被锁住的表的信息,语句如下:
SELECT 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
----以上为引用,下面是自己的方法
查看表是否锁住
select *
from dba_lock a
where a.lock_id1 in
(select t.object_id
from dba_objects t
where t.object_name = 'B_F_GL_BASE_STDC_AMT_ACC_A')
SELECT
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.STATUS,
s.terminal,
s.machine,
s.program,
s.osuser,
s.LOGON_TIME,
l.BLOCK
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
and l.BLOCK=1 --是否是死锁
--查询谁锁定,谁等待
SELECT
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;
果发生了锁等待,我们可能更想知道是谁锁了表而引起谁的等待
以上的语句可以查询到谁锁了表,而谁在等待。
以上查询结果是一个树状结构,如果有子节点,则表示有等待发生。
如果想知道锁用了哪个回滚段,还可以关联到V$rollname,其中xidusn就是回滚段的USN
找出谁锁定的记录,kill掉就行了。
-----------------------
Oracle杀死死锁进程
先查看哪些表被锁住了:
1获得sid
select b.owner,
b.object_name,
a.session_id,
a.locked_mode from v$locked_object a,
dba_objects b where b.object_id = a.object_id;
##########
2获得sid,serial
select b.username, b.sid, b.serial#, logon_time
from v$locked_object a, v$session b
where a.session_id = b.sid
order by b.logon_time
3杀
alter system kill session 'sid,serial';
如果有ora-00031错误,则在后面加immediate;alter system kill session '29,5497' immediate;
--杀数据库进程(数据库服务器的机子)
SELECT a.username, c.spid AS os_process_id, c.pid AS oracle_process_id
FROM v$session a, v$process c
WHERE c.addr = a.paddr
and a.sid ='1392'
and a.serial# ='10858';