之一:
Oracle数据库操作中,我们有时会用到锁表查询以及解锁和kill进程等操作
(1)锁表查询的代码有以下的形式:
select count(*) from v$locked_object;
select * from v$locked_object;
(2)查看哪个表被锁
select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id;
(3)查看是哪个session引起的
select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;
(4)杀掉对应进程
执行命令:alter system kill session '1025,41';
其中1025为sid,41为serial#.
之二:
先查看哪些表被锁住了
select b.owner,b.object_name,a.session_id,a.locked_mode
from v$locked_object a,dba_objects b
where b.object_id = a.object_id;
OWNER OBJECT_NAME SESSION_ID LOCKED_MODE
------------------------------ -------------------------------------- -------
WSSB SBDA_PSHPFTDT 22 3
WSSB_RTREPOS WB_RT_SERVICE_QUEUE_TAB 24 2
WSSB_RTREPOS WB_RT_NOTIFY_QUEUE_TAB 29 2
WSSB_RTREPOS WB_RT_NOTIFY_QUEUE_TAB 39 2
WSSB SBDA_PSDBDT 47 3
WSSB_RTREPOS WB_RT_AUDIT_DETAIL 47 3
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;
USERNAME SID SERIAL# LOGON_TIME
------------------------------ ---------- ---------- -----------
WSSB_RTACCESS 39 1178 2006-5-22 1
WSSB_RTACCESS 29 5497 2006-5-22 1
杀会话
alter system kill session 'sid,serial#';
alter system kill session '29,5497';
如果有ora-00031错误,则在后面加immediate;
alter system kill session '29,5497' immediate;
-------------
如何杀死oracle死锁进程
Oracle的死锁非常令人头疼,总结了一些点滴经验作为学习笔记
1.查哪个过程被锁
查V$DB_OBJECT_CACHE视图:
SELECT * FROM V$DB_OBJECT_CACHE WHERE OWNER='过程的所属用户' AND CLOCKS!='0';
2. 查是哪一个SID,通过SID可知道是哪个SESSION.
查V$ACCESS视图:
SELECT * FROM V$ACCESS WHERE OWNER='过程的所属用户' AND NAME='刚才查到的过程名';
3. 查出SID和SERIAL#
查V$SESSION视图:
SELECT SID,SERIAL#,PADDR FROM V$SESSION WHERE SID='刚才查到的SID'
查V$PROCESS视图:
SELECT SPID FROM V$PROCESS WHERE ADDR='刚才查到的PADDR';
4. 杀进程
(1).先杀ORACLE进程:
ALTER SYSTEM KILL SESSION '查出的SID,查出的SERIAL#';
(2).再杀操作系统进程:
KILL -9 刚才查出的SPID
或
ORAKILL 刚才查出的SID 刚才查出的SPID
------------------
oracle的死锁
查询数据库死锁
select t2.username||' '||t2.sid||' '||t2.serial#||' '||t2.logon_time||' '||t3.SQL_text
from v$locked_object t1,v$session t2,v$sqltext t3
where t1.session_id=t2.sid
and t2.sql_address=t3.address
order by t2.logon_time;
查询出来的结果就是有死锁的session了,
下面就是杀掉
拿到上面查询出来的SID和SERIAL#,填入到下面的语句中
alter system kill session 'sid,serial#';
一般情况可以解决数据库存在的死锁了,
或通过session id 查到对应的操作系统进程,在unix中杀掉操作系统的进程。
SELECT a.username,c.spid AS os_process_id,c.pid AS oracle_process_id FROM v$session a,v$process c
WHERE c.addr=a.paddr and a.sid= and a.serial#= ;
然后采用kill (unix) 或 orakill(windows )
在unix中
ps -ef|grep os_process_id
kill -9 os_process_id
ps -ef|grep os_process_id
-------------------
经常在oracle的使用过程中碰到这个问题,所以也总结了一点解决方法:)
1)查找死锁的进程:
sqlplus "/as sysdba" (sys/change_on_install)
SELECT s.username,l.OBJECT_ID,l.SESSION_ID,s.SERIAL#,l.ORACLE_USERNAME,l.OS_USER_NAME,l.PROCESS
FROM V$LOCKED_OBJECT l,V$SESSION S WHERE l.SESSION_ID=S.SID;
2)kill掉这个死锁的进程:
alter system kill session ‘sid,serial#’; (其中sid=l.session_id)
3)如果还不能解决,
select pro.spid from v$session ses,v$process pro where ses.sid=XX and ses.paddr=pro.addr;
其中sid用死锁的sid替换。
exit
ps -ef|grep spid
其中spid是这个进程的进程号,kill掉这个Oracle进程。