delete from t_user where id = 1;
alter table t_user enable row movement;
FLASHBACK TABLE t_user TO TIMESTAMP to_timestamp('2017-08-15 15:35:00','yyyy-mm-dd hh24:mi:ss');
delete from t_user where id = 1;
alter table t_user enable row movement;
FLASHBACK TABLE t_user TO TIMESTAMP to_timestamp('2017-08-15 15:35:00','yyyy-mm-dd hh24:mi:ss');