Ditto. Conner did a better job of stating it than I was going to. :)
Jared On Monday 30 December 2002 11:08, Connor McDonald wrote: > The space saving is good if you are not planning on > doing much more with those indexes (ie dml). The > space saving might be very very bad if there is lots > of dml to come. > > If you're indexes reached "equilibrium" during normal > operation of (say) 70% used, and then you rebuild them > with (say) pctfree 10, they pop up to 90% used and > thus the saved space. But if normal operations > continue, they will eventually drift out to 70% used > again and what's worse, you might get a bucketload of > index block splits during the process...could be a > nasty hit on dml performance > > hth > connor > > --- [EMAIL PROTECTED] wrote: > > > > Jared, thanks for the "asktom" article, very > > interesting reading - I'm not > > 100% sure I agree with him though. I just > > recently went through the > > exercise to rebuild our indexes into locally-managed > > tablespaces and I > > saved over 100GB of space through the rebuild > > process - as an example I had > > a 51GB unique index that went to 30GB after the > > rebuild (I'm not implying > > locally-managed had anything to do with the space > > savings, that was just > > for reducing/eliminating fragmentation). The > > indexes had not been > > rebuilt in over a year. Our DSS database is > > next; I expect to save at > > least that plus more in space. Not to discount > > Tom's arguments but I was > > very happy with the space savings and depending on > > your environment that > > can be very helpful/worthwhile. > > > > Just my opinion - guess it depends on your > > objectives. This > > discussion has definitely got me thinking in some > > different directions > > which is always a good thing. > > > > thanks again, > > > > John D. > > Atlanta, GA > > > > > > > > > > > > > > > > > > > > "Jared Still" > > > > > > <[EMAIL PROTECTED] To: > > "Multiple recipients of list ORACLE-L" > > <[EMAIL PROTECTED]> > > om> cc: > > (bcc: John Dailey/NAC/ING-FSI-NA) > > > > Sent by: > > Subject: Re: Rebuilding Indexes... > > > > [EMAIL PROTECTED] > > > > > > > > > > > > > > > > > > 12/26/2002 10:13 > > > > > > PM > > > > > > Please respond to > > > > > > ORACLE-L > > > > > > > > > > > > > > > > > > > > > > > > > > > > Though I have published a script for determining > > indexes that > > need to be rebuilt, and then rebuilding them, I > > have to say that > > this is almost never necessary. > > > > Why are you rebuilding indexes? About the only > > reason for ever > > doing so is that the BLEVEL >= 5. > > > > goto asktom.oracle.com, and do a search on 'index > > rebuild'. > > > > Currently, the third article may be of interest. > > > > Jared > > > > On Thursday 26 December 2002 12:24, Richard Huntley > > > > wrote: > > > Anyone have any useful scripts for doing this? > > > > > > TIA, > > > Rich > > > > ---------------------------------------- > > Content-Type: text/html; charset="iso-8859-1"; > > name="Attachment: 1" > > Content-Transfer-Encoding: 7bit > > Content-Description: > > ---------------------------------------- > > -- > > Please see the official ORACLE-L FAQ: > > http://www.orafaq.net > > -- > > Author: Jared Still > > 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: > > 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). > > ===== > Connor McDonald > http://www.oracledba.co.uk > http://www.oaktable.net > > "GIVE a man a fish and he will eat for a day. But TEACH him how to fish, > and...he will sit in a boat and drink beer all day" > > __________________________________________________ > Do You Yahoo!? > Everything you'll ever need on one web page > from News and Sport to Email and Music Charts > http://uk.my.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jared Still 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).
