create table t1 as select * from dba_objects;
[email protected]> select sysdate from dual;
SYSDATE
-------------------
2015-09-20 14:54:10
1 row selected.
[email protected]> delete from t1;
0 rows deleted.
[email protected]> commit;
Commit complete.
[email protected]> select count(*) from t1;
COUNT(*)
-----------------
0
1 row selected.
[email protected]> select count(*) from t1 as of timestamp to_timestamp(‘2015-09-20 14:54:00‘,‘yyyy-mm-dd hh24:mi:ss‘);
COUNT(*)
-----------------
91692
1 row selected.
[email protected]> flashback table t1 to timestamp to_timestamp(‘2015-09-20 14:54:00‘,‘yyyy-mm-dd hh24:mi:ss‘);
flashback table t1 to timestamp to_timestamp(‘2015-09-20 14:54:00‘,‘yyyy-mm-dd hh24:mi:ss‘) *
ERROR at line 1:
ORA-08189: cannot flashback the table because row movement is not enabled
[email protected]> alter table t1 enable row movement;
Table altered.
[email protected]> flashback table t1 to timestamp to_timestamp(‘2015-09-20 14:54:00‘,‘yyyy-mm-dd hh24:mi:ss‘);
Flashback complete.
[email protected]> select count(*) from t1;
COUNT(*)
-----------------
91692
1 row selected.
注意system表空间下面的表不能闪回，不能跨越DDL语句，
[email protected]> flashback table t2 to timestamp to_timestamp(‘2015-09-20 15:07:25‘,‘yyyy-mm-dd hh24:mi:ss‘);
flashback table t2 to timestamp to_timestamp(‘2015-09-20 15:07:25‘,‘yyyy-mm-dd hh24:mi:ss‘) *
ERROR at line 1:
ORA-08185: Flashback not supported for user SYS
但是可以查询：
[email protected]> select count(*) from t2 as of timestamp to_timestamp(‘2015-09-20 15:07:25‘,‘yyyy-mm-dd hh24:mi:ss‘);
COUNT(*)
-----------------
91694
1 row selected.
可以重新建一张表或者直接insert：
[email protected]> create table t3 as select * from t2 as of timestamp to_timestamp(‘2015-09-20 15:07:25‘,‘yyyy-mm-dd hh24:mi:ss‘);
Table created.
[email protected]> insert into t2 select * from t2 as of timestamp to_timestamp(‘2015-09-20 15:07:25‘,‘yyyy-mm-dd hh24:mi:ss‘);
91694 rows created.
@ORA12C> commit;
Commit complete.