Re: before image

From: Mark C. Stock <mcstockX_at_Xenquery>
Date: Fri, 1 Oct 2004 10:58:16 -0400
Message-ID: <LY-dnfspId0t7cDcRVn-pw@comcast.com>

"Odba2003" <odba2003_at_aol.com> wrote in message news:20041001104744.18589.00001733_at_mb-m29.aol.com...
|
| the question of before image vs pre-image has to do with Automatic Undo
| Management. Here is the context:
|
| Oracle stores the before image of the data in special purpose UNDO
tablespaces.
| Oracle also stores pre-images of data to enhance availability and read
| integrity for a query running in one session while another session is
| performing a dml transaction.
|
| I guess my question is, are before images the same thing as pre-images?
|
|

where's the above quote from?

++ mcs Received on Fri Oct 01 2004 - 09:58:16 CDT