Redo logs on disk or tape must be available for the entire time period spanned by the flashback logs. For example, if the flashback retention target is 1 week, then you must ensure that online and archived redo logs that contain all changes for the past week are accessible. In practice,...
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Oracle flashback table example 1 2 3 4 --rollback steps altertableTEST enable row movement; flashbacktableTESTtotimestampsysdate-30/1440; altertableTEST disable row movement;
COMMIT; The database administrator detects the application error and must diagnose the problem. The database administrator issues this query to retrieve versions of the rows in theemptable that correspond to empno111. The query uses Oracle Flashback Version Query pseudocolumns: SELECT versions_xid X...
在Oracle 11g里又出了一个新特性:Oracle Flashback Data Archive. FDA通过将变化数据另外存储到创建的闪回归档区(Flashback Archive)中,以和undo区别开来,这样就可以为闪回归档区单独设置存储策略,使之可以闪回到指定时间之前的旧数据而不影响undo策略。
(AUM)system to obtain metadata and historical data for transactions. They rely onundo data, which are records of the effects of individualtransactions. For example, if a user runs anUPDATEstatement tochange a salary from 1000 to 1100, then Oracle Database stores the value 1000in the undo ...
为了保存管理和备份恢复相关的文件,oracle10g提供了一个叫做闪回恢复区(Flashback recovery area),这个区域默认创建在oracle_base目录下。可以将所有恢复相关的文件,比如flashback log,archive log,backup set等,放到这个区域集中管理。 2.4.1.1.设置闪回恢复区...
06.08.2009 Toad and Oracle’s Flashback Technologies Over the past years “Flashback “became a buzzword in the Oracle world. In principles the database does not realize that a change has a history. So if you need to keep the old value before making a change to a specific row you...
In 12.2 this works just fine. In 19.6 it is broken. For example: Consider the folowing transaction: insert into emp3(empno) values (1); insert into emp3(empno) values (2); insert into emp3(empno) values (3); insert into emp3(empno) values (4); ...
The snapshot time is set to the SCN that most closely matches the time specified in query_time. "ENABLE_AT_SYSTEM_CHANGE_NUMBER Procedure" This procedure takes an SCN as an Oracle number and sets the session snapshot to the specified number. Inside the Flashback mode, all queries will...