数据库查询锁表以及解锁表的sql

之前程序运行的时候，突然发生页面卡死，后台不报错的现象，经过排查是数据库表被锁死，下面的sql是查询被锁的表，以及对应的解锁sql；

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;

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;

alter system kill session '300,37803';

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;