oracle 查询锁 && 解锁
查询数据库中的锁
select * from v$lock;
select * from v$lock where block=1;
查询被锁的对象
select * from v$locked_object;
查询阻塞
查被阻塞的会话
select * from v$lock where lmode=0 and type in ('TM','TX');
查阻塞别的会话锁
select * from v$lock where lmode>0 and type in ('TM','TX');
查询数据库正在等待锁的进程
select * from v$session where lockwait is not null;
查询会话之间锁等待的关系
select a.sid holdsid,b.sid waitsid,a.type,a.id1,a.id2,a.ctime from v$lock a,v$lock b
where a.id1=b.id1 and a.id2=b.id2 and a.block=1 and b.block=0;
查询锁等待事件
select * from v$session_wait where event='enqueue';
解决方案：
select session_id from v$locked_object; --首先得到被锁对象的session_id
SELECT sid, serial#, username, osuser FROM v$session where sid = session_id; --通过上面得到的session_id去取得v$session的sid和serial#，然后对该进程进行终止。
ALTER SYSTEM KILL SESSION 'sid,serial';
example:
ALTER SYSTEM KILL SESSION '13, 8';
