闪回技术
一:闪回删除flashback table “回收站的文件” to before drop恢复回收站的文件
二:闪回表
Sselect current_scn from v$database
create table c (id int)
insert into c select * from a as of scn+scn号
insert into c select * from a as of scn+scn号
uptada a set id=1000
alter session set nls_date_foerat=‘yyyy-mm-dd hh24:mi:ss’;
flashback table a to timestamp to_date(恢复的时间)
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