--查询被锁的表
select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id;
--查看是哪个session引起的
select b.username,b.sid,b.serial#,logon_time from  v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;
--杀掉对应进程即解锁
alter system kill session ‘1190,3103‘;

--查询存储过程被锁
--查V$DB_OBJECT_CACHE
SELECT * FROM V$DB_OBJECT_CACHE WHERE name=‘P_QUERY_BILL_LIST‘ AND LOCKS!=‘0‘;
--按对象查出sid的值
select /*+ rule*/  SID from V$ACCESS WHERE object=‘P_QUERY_BILL_LIST‘;
--查sid,serial#
SELECT SID,SERIAL#,PADDR FROM V$SESSION WHERE SID in (‘1160‘);
--杀掉对应进程即解锁
alter system kill session ‘1160,41565‘;

--数据库恢复
insert into sys_user_t value(
select * from sys_user_t as of timestamp to_timestamp(‘2019-10-17 10:20:00‘,‘yyyy-mm-dd hh24:mi:ss‘)
)

-- 查询最后修改的对象
SELECT  object_name,CREATED,LAST_DDL_TIME from user_objects order by last_ddl_time desc;
SELECT  object_name,CREATED,LAST_DDL_TIME from user_objects order by created desc;

-- 编码
select userenv(‘language‘)from dual

环境变量名：NLG_LANG
环境变量值：SIMPLIFIED CHINESE_CHINA.ZHS16GBK