Oracle 11g 常用sql记录

--表备份

create table xxx_bak as select * from xxx;

--表数据清除

truncate table xxx

--锁表问题处理sql开始

　　select session_id from v$locked_object,user_objects where v$locked_object.object_id = user_objects.object_id;--查询session_id

　　select serial# from v$session where sid = '1181';--查询serial

　　alter system kill session '1181,11454';--根据查到的session_id和serial执行

--锁表问题处理sql结束

--查看和创建dba文件目录

select * from dba_directories;

create directory XXX_DATADUMP AS '/opt/xxxdatadump'

--查看历史数据

select * from xxx_table as of timestamp to_timestamp ('2020-01-01 10:00:00', 'yyyy-mm-dd hh24:mi:ss');

--开启可移动数据命令

alter table xxx_table enable row movement;

--查看数据库字符集

select userenv('language') from dual;

--查看open_mode、是否开启日志、回滚

select open_mode,log_mode,flashback_on from v$database;