Oracle锁表处理

在生产环境中过多的DML操作或者程序的一些错误时会导致数据表锁表现象，出现锁表时可通过以下语句进行处理解锁，但该处理方式只是临时处理，造成数据表死锁的真正原因需要在根源上排查根治。

 1 --查看锁表进程SQL语句1：
 2 --被锁对象表、数据库对象表、数据session表关联来获取被锁对象对应的是那个session；
 3 select sess.sid, 
 4 sess.serial#, 
 5 lo.oracle_username, 
 6 lo.os_user_name, 
 7 ao.object_name, 
 8 lo.locked_mode 
 9 from v$locked_object lo, 
10 dba_objects ao, 
11 v$session sess 
12 where ao.object_id = lo.object_id and lo.session_id = sess.sid;
13 --通过上面的查询获取SID和serial#，替换下面的x,y,就可以解除被锁的状态
14 alter system kill session 'X,XX';
15 --查看锁表进程SQL语句2： 
16 select * from v$session t1, v$locked_object t2 where t1.sid = t2.SESSION_ID;
17 --查看那个用户那个进程照成死锁
18 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;
19 --查看导致锁表的sql语句是那一条
20 select l.session_id sid, 
21 s.serial#, 
22 l.locked_mode, 
23 l.oracle_username, 
24 s.user#, 
25 l.os_user_name, 
26 s.machine, 
27 s.terminal, 
28 a.sql_text, 
29 a.action 
30 from v$sqlarea a, v$session s, v$locked_object l 
31 where l.session_id = s.sid 
32 and s.prev_sql_addr = a.address 
33 order by sid, s.serial#;
34 --批量解锁：
35 declare cursor mycur is  
36 select b.sid,b.serial#  
37 　　from v$locked_object a,v$session b  
38 　　where a.session_id = b.sid group by b.sid,b.serial#;  
39 begin  
40   for cur in mycur  
41     loop    
42      execute immediate ( 'alter system  kill session  '''||cur.sid || ','|| cur.SERIAL# ||''' ');  
43      end loop;  
44 end; 
45 --批量解锁语句生成
46 SELECT A.OBJECT_NAME,
47              B.SESSION_ID,
48              C.SERIAL#,
49             ( 'alter system  kill session  '''||b.session_id || ','|| c.SERIAL# ||''' ')
50 AS TEXT, C.PROGRAM, C.USERNAME, C.COMMAND, C.MACHINE, C.LOCKWAIT
51  FROM ALL_OBJECTS A, V$LOCKED_OBJECT B, V$SESSION C WHERE A.OBJECT_ID = B.OBJECT_ID AND C.SID = B.SESSION_ID;