1、
sql> select count(*) from test order by id;
count(*)
----------
1202、delete from test where id<50
commit;
3、sql> select dbms_flashback.get_system_change_number from dual;----最好查訊到當前scn，否則有時會出現
ora-30052: invalid lower limit snapshot expression錯誤，sql>alter system set undo_retention=10800 scope=both;
get_system_change_number
------------------------
610896
4、select versions_xid, versions_operation from test versions between scn 610000 and 610896 order by 2;
versions_xid versions_operation
06002e0019010000 d
06002e0019010000 d
5、select xid,commit_scn,commit_timestamp,operation,undo_sql from flashback_transaction_query q where q.xid='06002e0019010000'
6、通過scn閃回，提交的scn為610521，應該閃回到610520
insert into test
select * from test as of scn 610520
where id not in (select id from test);
7、通過時間閃回
insert into test
select * from test as of timestamp to_timestamp('2010-5-24 10:29:15', 'yyyy-mm-dd hh24:mi:ss')
where id not in (select id from test);
commit；
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