What is ITL ?
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
Sent: Wednesday, December 24, 2003 4:59 PM
>
> Just the previous version of the changed columns,
> plus an overhead of about 80 bytes which relates
> to ITLs, linked lists, operation descriptions etc.
>
> Bear in mind that undo relating to indexes is not
> the same as undo relating to tables, though. An
> update to an indexed column results in one index
> entry being deleted (so the whole index entry
> is coped to the undo) and another index entry
> being inserted (which also means the whole (new)
> index entry being copied to the undo).
>
> There is a statistic relating to undo size in v$sysstat/v$sesstat
> in the most recent versions of Oracle.
>
> While a transaction is active, you can track it in v$transaction,
> and there are two columns in that view giving you information
> about the undo - used_urec (undo records created) and used_ublk
> (undo block used).
>
> Regards
>
> Jonathan Lewis
> http://www.jlcomp.demon.co.uk
>
> The educated person is not the person
> who can answer the questions, but the
> person who can question the answers -- T. Schick Jr
>
>
> One-day tutorials:
> http://www.jlcomp.demon.co.uk/tutorial.html
>
>
> Three-day seminar:
> see http://www.jlcomp.demon.co.uk/seminar.html
> ____UK___November
>
>
> The Co-operative Oracle Users' FAQ
> http://www.jlcomp.demon.co.uk/faq/ind_faq.html
>
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Wednesday, December 24, 2003 8:44 PM
>
>
> > I have a related question : What about update? In rollback segment :
> > Will it store the whole row for before image or just the changed column
> > and rowid. Is there a way to get the size of the rollback from some
> > where in the database. or v$ views. Like we can get an idea about redo
> > size from redo log files generated. Thank you
> >
> >
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Jonathan Lewis
> INET: jonathan_at_jlcomp.demon.co.uk
>
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Akshay Kumar
INET: akshay349_at_hotmail.com
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
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Received on Fri Dec 26 2003 - 12:54:26 CST
