Dennis , so what you are trying to say is that the redo logs store undo data
also ?
- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
Sent: Sunday, May 18, 2003 09:41
> Not every statement is committed. Some are rolled back. So when the
database
> is recovered, these statements must again be rolled back.
>
> Dennis Williams
> DBA, 80%OCP, 100% DBA
> Lifetouch, Inc.
> dwilliams_at_lifetouch.com
>
>
> -----Original Message-----
> Sent: Saturday, May 17, 2003 9:09 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Hello list
>
> the "backup and recovery concepts" manual says :"Each redo record contains
> both the old and the new values. Oracle also records the old value to an
> undo block located either in a rollback segment (if running in manual undo
> management mode) or in a dedicated undo tablespace (if running in
automatic
> undo management mode)."
>
> Does this mean that undo data is stored in both the undo tablespace and
the
> redo
> logs ?
>
> I thought that only statements were stored in the redo log file.
>
> If undo data is stored in the redo logs also, then , do we need the undo
> tablespace during recovery ? shouldn't the redo logs be enough ?
>
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> Author: <bulbultyagi_at_now-india.net.in
> INET: bulbultyagi_at_now-india.net.in
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> Author: DENNIS WILLIAMS
> INET: DWILLIAMS_at_LIFETOUCH.COM
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Received on Mon May 19 2003 - 16:57:33 CDT
