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:appflashdataflash_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 '2' 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 ( '2', '3' );

参考

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