select userenv(‘language’) from dual;    查看oracle字符集

alter user scott account unlock; 解锁

select username,lock_date from dba_users where username=’scott’;    查看锁定时间

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;    查看被锁定的表