SELECT /*+ rule */ s.username,
 decode(l.type,'TM','TABLE LOCK',
 'TX','ROW LOCK',
 NULL) LOCK_LEVEL,
 o.owner,o.object_name,o.object_type,
 s.sid as sid,s.serial# as serial#,s.terminal,s.machine,s.program,s.osuser
 FROM v$session s,v$lock l,dba_objects o
 WHERE l.sid = s.sid
 AND l.id1 = o.object_id(+)
 AND s.username is NOT NULL
 
--kill session语句alter system kill session'sid,serial#';
 alter system kill session'10,46004';
 --以下几个为相关表
 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;
--1.查出锁定object的session的信息以及被锁定的object名
SELECT l.session_id sid, s.serial# as serial#, l.locked_mode,l.oracle_username,
 l.os_user_name,s.machine, s.terminal, o.object_name, s.logon_time
 FROM v$locked_object l, all_objects o, v$session s
 WHERE l.object_id = o.object_id
 AND l.session_id = s.sid
 ORDER BY sid, s.serial# ;
 --2.查出锁定表的session的sid, serial#,os_user_name, machine name, terminal和执行的语句
 --比上面那段多出sql_text和action
 SELECT l.session_id sid, s.serial#, l.locked_mode, l.oracle_username, s.user#,
 l.os_user_name,s.machine, s.terminal,a.sql_text, a.action
 FROM v$sqlarea a,v$session s, v$locked_object l
 WHERE l.session_id = s.sid
 AND s.prev_sql_addr = a.address
 ORDER BY sid, s.serial#;
 --3.查出锁定表的sid, serial#,os_user_name, machine_name, terminal，锁的type,mode
 SELECT s.sid, s.serial#, s.username, s.schemaname, s.osuser, s.process, s.machine,
 s.terminal, s.logon_time, l.type
 FROM v$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。
 --杀锁命令
 alter system kill session 'sid,serial#'
 SELECT /*+ rule */ s.username,
 decode(l.type,'TM','TABLE LOCK',
 'TX','ROW LOCK',
 NULL) LOCK_LEVEL,
 o.owner,o.object_name,o.object_type,
 s.sid,s.serial#,s.terminal,s.machine,s.program,s.osuser
 FROM v$session s,v$lock l,dba_objects o
 WHERE l.sid = s.sid
 AND l.id1 = o.object_id(+)
 AND s.username is NOT NULL
 --以上查询结果是一个树状结构，如果有子节点，则表示有等待发生。
 --如果想知道锁用了哪个回滚段，还可以关联到V$rollname，其中xidusn就是回滚段的USN
 col user_name format a10
 col owner format a10
 col object_name format a10
 col object_type format a10
  --如果发生了锁等待，我们可能更想知道是谁锁了表而引起谁的等待
 --以下的语句可以查询到谁锁了表，而谁在等待。
 SELECT /*+ rule */ lpad(' ',decode(l.xidusn ,0,3,0))||l.oracle_username User_name,
 o.owner,o.object_name,o.object_type,s.sid,s.serial#
 FROM v$locked_object l,dba_objects o,v$session s
 WHERE l.object_id=o.object_id
 AND l.session_id=s.sid
 ORDER BY o.object_id,xidusn DESC

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