so GTT's help reducing redo when you do inserts and deletes? but not for deletes? there was a post by tom kyte on dejanews from a few years back where someone asked the redo question and he recommended GTTs.
here is the link... did I misread it? http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=89r5a7%249q3%241%40nnrp1.deja.com&rnum=1&prev=/groups%3Fq%3Doracle%2Bglobal%2Btemp%2B%2Bkyte%2Bredo%26ie%3DUTF-8%26oe%3DUTF-8%26hl%3Den%26btnG%3DGoogle%2BSearch > > From: Richard Foote <[EMAIL PROTECTED]> > Date: 2003/05/29 Thu AM 08:45:46 EDT > To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> > Subject: Re: Which method is more efficient > > > ----- Original Message ----- > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > Sent: Thursday, May 29, 2003 3:14 AM > > > > 1. to totally eliminate redo, load your staging records into a global temp > table. it has absolutely no redo and is very fast. > > Hi > > The above is not quite true. Global temp tables *do* generate redo (albeit > indirectly) and potentially quite a bit of it. The point to make here is > that changes to GTT generate undo and this undo makes changes to undo > segments and these changes subsequently generate redo. So depending on the > type of DML (eg. deletes) and the volume of changes, you can end up > generating quite a bit of the redo. > > Not as much as a non-GTT but enough to certainly invalidate the above > statement. > > Cheers > > Richard Foote > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Richard Foote > 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: <[EMAIL PROTECTED] 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).
