oracle的锁表与解锁

--以下几个为相关表

SELECT * FROM v$lock;

SELECT * FROM v$sqlarea;

SELECT * FROM v$session;

SELECT * FROM v$process ;

SELECT * FROM v$locked_object;

SELECT * FROM all_objects;

SELECT * FROM v$session_wait;

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 order by last_call_et desc;

 

方法/步骤

1. 查出锁定object的session的信息以及被锁定的object名

   SELECT l.session_id sid, s.serial#, l.locked_mode,l.oracle_username,

   l.os_user_name,s.machine, s.terminal, o.object_name, s.logon_time

   FROM v$locked_object l, all_objects o, v$session s

   WHERE l.object_id = o.object_id

   AND l.session_id = s.sid

   ORDER BY sid, s.serial# ;

    
2. 查出锁定表的session的sid, serial#,os_user_name, machine name, terminal和执行的语句

   --比上面那段多出sql_text和action

   SELECT l.session_id sid, s.serial#, l.locked_mode, l.oracle_username, s.user#,

   l.os_user_name,s.machine, s.terminal,a.sql_text, a.action

   FROM v$sqlarea a,v$session s, v$locked_object l

   WHERE l.session_id = s.sid

   AND s.prev_sql_addr = a.address

   ORDER BY sid, s.serial#;
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$session s, v$lock l

   WHERE s.sid = l.sid

   AND s.username IS NOT NULL

   ORDER BY sid;

   ign:left;mso-layout-grid-align: none;text-autospace:none'>ORDER BY sid, s.serial#;
4. 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。

   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
5. 查询到谁锁了表，而谁在等待。

   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

    
6. 查询后台执行语句的‘sid’与‘SERIAL’

   select distinct 'alter system kill session ''' || s.sid || ',' ||s.SERIAL# || '''' || ';'

   FROM v$locked_object l, all_objects o, v$session s

   WHERE l.object_id = o.object_id

   AND l.session_id = s.sid
7. 根据上图的语句可以在命令窗口进行批量杀进行  

   --kill session语句

   alter system kill session'50,492';