还原数据库表到一个固定的时间点
alter table s_test enable row movement; flashback table s_test to timestamp to_timestamp('2018-03-05 15:25:00','yyyy-mm-dd HH24:MI:SS');
alter table s_test enable row movement; flashback table s_test to timestamp to_timestamp('2018-03-05 15:25:00','yyyy-mm-dd HH24:MI:SS');