可以用Spotlight软件对数据库的运行状态进行监控。
当出现session锁时,我们要及时进行处理.
1. 查看哪些session锁:
SQL语句:select 'alter system kill session '''||sid||','||serial#||''';' from v$session where sid in (select sid from v$lock where block = 1);
SQL> select 'alter system kill session '''||sid||','||serial#||''';' from v$session where sid in (select sid from v$lock where block = 1);
'ALTERSYSTEMKILLSESSION'''||SID||','||SERIAL#||''';'
--------------------------------------------------------------------------------
alter system kill session '132,731';
alter system kill session '275,15205';
alter system kill session '308,206';
alter system kill session '407,3510';
2. 查看session锁.
sql语句:select s.sid, q.sql_text from v$sqltext q, v$session s
where q.address = s.sql_address
and s.sid = &sid
order by piece;
SQL> select s.sid,q.sql_text from v$sqltext q, v$session s where q.address = s.sql_address and s.sid in (select sid from v$lock where block = 1) order by piece;
SID SQL_TEXT
---------- ----------------------------------------------------------------
77 UPDATE PROFILE_USER SET ID=1,COMPANY_ID=2,CUSTOMER_ID=3,NAMED
77 _INSURED_ID=4,LOGIN=5,ROLE_ID=6,PASSWORD=7,EMAIL=8,TIME_ZON
77 E=9 WHERE PROFILE_USER.ID=:34
3 rows selected.
3. kill锁的进程.
SQL语句:alter system kill session '77,22198';
SQL> alter system kill session '391,48398';
System altered.
4. 查看谁锁了谁。
select s1.username || [email='@']'@'[/email] || s1.machine
|| ' ( SID=' || s1.sid || ' ) is blocking '
|| s2.username || [email='@']'@'[/email] || s2.machine || ' ( SID=' || s2.sid || ' ) ' AS blocking_status
from v$lock l1, v$session s1, v$lock l2, v$session s2
where s1.sid=l1.sid and s2.sid=l2.sid
and l1.BLOCK=1 and l2.request > 0
and l1.id1 = l2.id1
and l2.id2 = l2.id2 ;
注:
> : 重定向输出,将文件的标准输出重新定向输出到文件,或将数据文件作为另一程序的标准输入内容。
| :UNIX管道:将一文件的输出作为另一文件的输入.
在执行SQL语句试:alter system kill session '391,48398'(sid为391); 应当注意对于sid在100以下的应当谨慎,可能该进程对应某个application,如对应某个事务,可以kill.