Oracle锁机制

2021/4/22 19:25:34

本文主要是介绍Oracle锁机制,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

  • 以下几个相关的表

    SELECT * FROM v$lock;
    SELECT * FROM v$sqlarea;
    SELECT * FROM v$session;
    SELECT * FROM v$process ;
    SELECT * FROM v$locked_object;
    SELECT * FROM all_objects;
    SELECT * FROM v$session_wait;
    
  • 查看被锁的表

    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;
    
  • 查看那个用户那个进程照成死锁

    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;
    
  • 查看连接的进程

    SELECT sid, serial#, username, osuser FROM v$session;
    
  • 查出锁定表的sid, serial#,os_user_name, machine_name, terminal,锁的type,mode

    SELECT s.sid, s.serial#, s.username, s.schemaname, s.osuser, s.process, s.machine,
    s.terminal, s.logon_time, l.type
    FROM v$session s, v$lock l
    WHERE s.sid = l.sid
    AND s.username IS NOT NULL
    ORDER BY sid;
    /*这个语句将查找到数据库中所有的DML语句产生的锁,还可以发现,
    任何DML语句其实产生了两个锁,一个是表锁,一个是行锁。*/
    
  • 杀掉进程 sid,serial#

    alter system kill session'210,11562';
    


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