Oracel 锁的相关知识

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 ;