Oracle 闪回归档(Flashback Data Archive)

--检查权限
SELECT
    *
FROM
    dba_sys_privs
WHERE
    privilege LIKE '%FLASH%';

--设置权限
GRANT dba TO testuser;--设置dba权限
GRANT flashback archive administer TO testuser;

--设置闪回数据归档权限--创建表空间
/*
create tablespace flash_tbs1
logging
datafile 'D:\app\flashdata\flash_tbs1.dbf'
size 50m
autoextend on
next 10m maxsize 400m
extent management local;
*/

--创建闪回归档
CREATE flashback archive flash1 tablespace flash_tbs1 quota 10M retention 5 year;

-- 设置为默认的闪回归档
ALTER flashback archive flash1
SET DEFAULT;

--查看闪回归档设置的状态
SELECT
    flashback_archive_name,
    status
FROM
    dba_flashback_archive;

--设置table闪回归档
ALTER TABLE Table1 flashback archive flash1;
ALTER TABLE Table2 flashback archive flash1;

--查询开启闪回归档的Table
SELECT
    *
FROM
    dba_flashback_archive_tables;

查询结果
Table1 SYSTEM FLASH1 SYS_FBA_HIST_73432 ENABLED 
Table2 SYSTEM FLASH1 SYS_FBA_HIST_73542 ENABLED 

--查看T_ORG_DEPT表的历史变更记录
SELECT
    *
FROM
    SYS_FBA_HIST_73542 

--查数据库中所有的闪回数据归档
SELECT
    flashback_archive_name,
    retention_in_days
FROM
    dba_flashback_archive;

--查有关闪回数据归档所使用的表空间的信息
SELECT
    flashback_archive_name,
    tablespace_name,
    quota_in_mb
FROM
    dba_flashback_archive_ts;

--查询当前scn号
SELECT
    current_scn
FROM
    v$database;

查询结果
1043955 
1043958 
1044070 
1044700 

--依据scn号查询历史数据
SELECT
    *
FROM
    T_ORG_DEPT AS OF scn 1044070;

--依据时间戳查询历史数据，不能大于当前时间。
SELECT
    *
FROM
    T_ORG_DEPT AS OF TIMESTAMP to_timestamp( '20180221 00:00:00', 'yyyymmdd hh24:mi:ss' );

--清除2天前的
ALTER flashback archive flash1 purge before timestamp ( systimestamp - interval '' day );

--清除scn号前的立即
ALTER flashback archive flash1 purge before scn 1044700;

--查询归档的数据，如果清空全部则无法查询到历史归档数据
SELECT
 * 
FROM
 SYS_FBA_HIST_73542 
--多表测试
SELECT
    Table1.NAME,
    Table2.NAME
FROM
    Table1 AS OF TIMESTAMP to_timestamp( '20180221 00:00:00', 'yyyymmdd hh24:mi:ss' )
    INNER JOIN Table3 ON Table1.ID = Table3.PERSONID
    INNER JOIN Table2 AS OF TIMESTAMP to_timestamp( '20180221 00:00:00', 'yyyymmdd hh24:mi:ss' ) ON Table3.DEPTID = Table2.ID
WHERE
    Table1.id IN ( '', '3' );

参考

http://blog.csdn.net/guoyjoe/article/details/9199963