可以通过函数SCN_TO_TIMESTAMP（10g以后）将其转换回timestamp： select dbms_flashback.get_system_change_number, SCN_TO_TIME
可以通过函数SCN_TO_TIMESTAMP（10g以后）将其转换回timestamp：
select dbms_flashback.get_system_change_number, SCN_TO_TIMESTAMP(dbms_flashback.get_system_change_number) from dual;
也可以用函数timestamp_to_scn将一个timestamp转换为SCN：
select timestamp_to_scn(SYSTIMESTAMP) as scn from dual;
如果你想把DATE类型转换成TIMESTAMP类型，就使用CAST函数。
select cast(sysdate as timestamp) from dual;
--恢复到几分钟前
select t.*, t.rowid from ar_mid_acap as of timestamp sysdate - 5 / 1440 t;
--恢复到具体的某个时间点
select *
from ar_mid_acap as of scn timestamp_to_scn(To_Date('2012-4-25', 'yyyy-mm-dd hh24:mi:ss'));
--两个时间点间的变化信息
select v_id, va, versions_startscn, versions_endscn, versions_operation
from t_fb_test versions between scn 12372466 and 12372538
order by 1;
--恢复语句undo
select xid, commit_scn, commit_timestamp, operation, undo_sql
from flashback_transaction_query q
where q.xid in
(select versions_xid
from t_fb_test versions between scn 23413946 and 23413959);
--恢复表
FLASHBACK TABLE goodsinfo1 TO BEFORE DROP;
每个人都需要一台速度更快、更稳定的 PC。随着时间的推移，垃圾文件、旧注册表数据和不必要的后台进程会占用资源并降低性能。幸运的是，许多工具可以让 Windows 保持平稳运行。
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