此文章来至于:http://www.cnblogs.com/chuanzifan/archive/2012/05/26/2519695.html
当某个数据库用户在数据库中插入、更新、删除一个表的数据,或者增加一个表的主键时或者表的索引时,常常会出现ora-00054:resource busy and acquire with nowait specified这样的错误。
主要是因为有事务正在执行(或者事务已经被锁),所有导致执行不成功。
1、用dba权限的用户查看数据库都有哪些锁
select t2.username,t2.sid,t2.serial#,t2.logon_time
from v$locked_object t1,v$session t2
where t1.session_id=t2.sid order by t2.logon_time;
如:testuser 339 13545 2009-3-5 17:40:05
知道被锁的用户testuser,sid为339,serial#为13545
2、根据sid查看具体的sql语句,如果sql不重要,可以kill
select sql_text from v$session a,v$sqltext_with_newlines b
where DECODE(a.sql_hash_value, 0, prev_hash_value, sql_hash_value)=b.hash_value
and a.sid=&sid order by piece;
查出来的sql,如: begin :id := sys.dbms_transaction.local_transaction_id; end;
3、kill该事务
alter system kill session '339,13545';
4、这样就可以执行其他的事务sql语句了
如增加表的主键:
alter table test
add constraint PK_test primary key (test_NO);
若提示:ORA-00030: User session ID does not exist
alter session set events 'immediate trace name flush_cache level 1';
后果不详
ORA-00031: session marked for kill
一些ORACLE中的进程被杀掉后,状态被置为"killed",但是锁定的资源很长时间不释放,有时实在没办法,只好重启数据库。现在提供一种方法解决这种问题,那就是在ORACLE中杀不掉的,在OS一级再杀。
1.下面的语句用来查询哪些对象被锁:
select object_name,machine,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;
2.下面的语句用来杀死一个进程:
alter system kill session '24,111'; (其中24,111分别是上面查询出的sid,serial#)
【注】以上两步,可以通过Oracle的管理控制台来执行。
3.如果利用上面的命令杀死一个进程后,进程状态被置为"killed",但是锁定的资源很长时间没有被释放,那么可以在os一级再杀死相应的进程(线程),首先执行下面的语句获得进程(线程)号:
select spid, osuser, s.program
from v$session s,v$process p
where s.paddr=p.addr and s.sid=24 (24是上面的sid)
4.在OS上杀死这个进程(线程):
1)在unix上,用root身份执行命令:
#kill -9 12345(即第3步查询出的spid)
2)在windows(unix也适用)用orakill杀死线程,orakill是oracle提供的一个可执行命令,语法为:
orakill sid thread
其中:
sid:表示要杀死的进程属于的实例名
thread:是要杀掉的线程号,即第3步查询出的spid。
例:c:>orakill orcl 12345
ORA-00031: session marked for kill
Cause: The session specified in an ALTER SYSTEM KILL SESSION command cannot be killed immediately (because it is rolling back or blocked on a network operation), but it has been marked for kill. This means it will be killed as soon as possible after its current uninterruptible operation is done.
Action: No action is required for the session to be killed, but further executions of the ALTER SYSTEM KILL SESSION command on this session may cause the session to be killed sooner.