1 查出被锁的表信息
 SELECT /*+ rule*/
 a.sid, b.owner, object_name, object_type
 FROM v$lock a, all_objects b
 WHERE TYPE = ‘TM‘
 and a.id1 = b.object_id;

 --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#, 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;

 2 查出serial
 SELECT sid,serial# FROM v$session WHERE sid = 662;
 
 3 杀掉session
 alter system kill session ‘662,44825‘;

 SELECT ‘alter system kill session ‘‘‘||sid||‘,‘||serial#||‘‘‘;‘ FROM v$session WHERE username=‘DCDB‘;

 4 查出是否有长时间执行的SQL
 select a.sid, b.sql_text
  from v$session a, v$sqlarea b
  where a.sql_hash_value = http://www.mamicode.com/b.hash_value
   and a.sid in
       (SELECT SID from GV$Session_longops where TIME_REMAINING > 0);

表解锁