What is ITL ? ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> 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$transaction, > and there are two columns in that view giving you information > about the undo - used_urec (undo records created) and used_ublk > (undo block used). > > Regards > > Jonathan Lewis > http://www.jlcomp.demon.co.uk > > The educated person is not the person > who can answer the questions, but the > person who can question the answers -- T. Schick Jr > > > One-day tutorials: > http://www.jlcomp.demon.co.uk/tutorial.html > > > Three-day seminar: > see http://www.jlcomp.demon.co.uk/seminar.html > ____UK___November > > > The Co-operative Oracle Users' FAQ > http://www.jlcomp.demon.co.uk/faq/ind_faq.html > > > ----- Original Message ----- > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > Sent: Wednesday, December 24, 2003 8:44 PM > > > > I have a related question : What about update? In rollback segment : > > Will it store the whole row for before image or just the changed column > > and rowid. Is there a way to get the size of the rollback from some > > where in the database. or v$ 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: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Akshay Kumar INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).