锁

• 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';