Who Write Undo Information From The DbCache To The Physically UndoDatafile.

From: Sheldon Quinny <sheldonquinny@xxxxxxxxx>
To: undisclosed-recipients: ;
Date: Thu, 12 May 2005 15:07:41 +0530

Hi, 
I Got An Question , Been Searching The Documentation .. Not Getting An 
Hang Of It. 
 
I Would Like To Know , If Undo Block Is Brought In The Buffer Cache, 
During An Update.. SO What Process Write The Undo Block [Old Image] To 
The Physically Undo Datafile. 
 
And The Storage Way To Save Information On The Undo Datafile Is 
Diffrent From Normal Datafile.. 
 
I Would Like Some One To Help Me Explain .. Who Writes The Undo Image 
And How Is The Flow Work On From Buffer Cache To Undo Datafile. 
 

Can U Give Me Autentication Of This In The Oracle 9i Documentation. 
 
My Basic Logic Say So , DBWR Does The Writting Of The Data From The 
Cache To The Datafile. And UnDo Is Also An Datafile...But A Senior Dba 
Says Its The Server Process That Does The Writes In The Undo Datafile. 
 
Its An Senior Dba Word..So I Am Wondering. How Can I Give An 
Explanation Of Dbwr Doing Writing ..And Not Server Process. 
 

<http://groups-beta.google.com/group/comp.databases.oracle.server/browse_thread/thread/b086f1f5cb8848a4/d0ead446037ee5a8?hl=en#>


 Thank You , 
 Sheldon Quinny

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Who Write Undo Information From The DbCache To The Physically UndoDatafile.

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