ORACLE ORA-04021:等待锁定对象XX时发生超时 杀死引起锁定的会话
今天遇到一个问题:在编译存储过程时开发工具卡死.
经验证明这是其它会话在执行该过程.
查询是否该过程在执行:
select a.SID,a.SERIAL#,b.SQL_FULLTEXT,a.MACHINE,a.STATUS,a.BLOCKING_SESSION,a.BLOCKING_SESSION_STATUS
from v$session a, v$sql b
where a.SQL_ID = b.SQL_ID
and a.USERNAME = 'KDBASE';
1 8 13857 <CLOB> WORKGROUP\WIN-EVS47DI7BMP ACTIVE NO HOLDER
2 67 3984 <CLOB> WORKGROUP\WIN-EVS47DI7BMP INACTIVE NO HOLDER
3 67 3984 <CLOB> WORKGROUP\WIN-EVS47DI7BMP INACTIVE NO HOLDER
4 72 5588 <CLOB> WORKGROUP\LCJ-PC ACTIVE UNKNOWN
5 83 22191 <CLOB> WORKGROUP\LCJ-PC ACTIVE UNKNOWN
6 227 8739 <CLOB> WORKGROUP\LCJ-PC ACTIVE UNKNOWN
发现在会话72,5588正在执行
BEGIN UP_MID_88011113( :1, :2, :3, :4, :5, :6, :7, :8, :RC1, :RC2 ); END;
找到原因,杀死会话
alter system kill session '72,5588';
杀死后,再查询,发现会话状态己改了
1 72 5588
由ACTIVE改成KILLED了.
但是依然无法编译这个存储过程.说明kill session只是把会话的状态改了一下而已,会话使用的资源依然没有释放.
alter system kill session命令无效,现在要用orakill来做了.
orakill是ORACLE用来杀死线程的工具.
现在来查询一下线程号:
SELECT s.sid AS "Sid",
s.serial# AS "Serial#",
p.spid AS "ThreadID",
s.osuser AS "OSUser",
s.program AS "Program"
FROM v$process p, v$session s
WHERE p.addr = s.paddr(+)
and s.SID=72;
1 72 5588 8844 LCJ kcbpas.exe
操作系统线程号是5588,用ORAKILL来杀吧:
ORAKILL用法:
Usage: orakill sid thread
快来试试吧:
C:\Users\Administrator>orakill orcl 8844
Kill of thread id 8844 in instance orcl successfully signalled.
再执行一遍查询:
SQL> SELECT s.sid AS "Sid",
2 s.serial# AS "Serial#",
3 p.spid AS "ThreadID",
4 s.osuser AS "OSUser",
5 s.program AS "Program"
6 FROM v$process p, v$session s
7 WHERE p.addr = s.paddr(+)
8 and s.SID=72
9 /
Sid Serial# ThreadID OSUser Program
---------- ---------- ------------ ------------------------------ ----------------------------------------------------------------
没查到数据,说明该线程已经被杀死了.
再来编译一下存储过程.
依然是ORA-04021:等待锁定对象XX时发生超时!!怎么回事!
原来,执行KILL SESSION 命令后,会改变会话的PADDR,就是进程地址,指向一个虚拟的地址.请参考:
http://www.eygle.com/faq/Kill_Session.htm
查询会话原来的PADDR:
SELECT s.sid AS "Sid",
s.serial# AS "Serial#",
p.spid AS "ThreadID",
p.ADDR,
p.USERNAME,
p.TERMINAL,
p.PROGRAM
FROM v$process p, v$session s
WHERE p.addr = s.paddr(+)
and p.PID<>1
and s.SID is null
1 8532 000007FF38006A80 SYSTEM WINDOWS-E4VC1PI ORACLE.EXE (D000)
2 5384 000007FF380072A8 SYSTEM WINDOWS-E4VC1PI ORACLE.EXE (S000)
杀掉这两个进程
orakill orcl 8532
orakill orcl 5384
存储过程依然不能编译,说明用这种方法查询的是有问题.
而且测试过程中,用上面个查询查到的线程号是会变的,也就是说用执行上面两个ORAKILL后,再次执行查询,会查出来两条其它的线程!!
看来要用ORAKILL,在执行kill session命令之前要先查出会话的paddr,然后执行kill session命令,如果kill session不奏效,再通过刚才查出来的paddr查v$process表,找到线程号.有环境一定要实验一下.