This is nothing compared to your work's contribution to my knowledge, but you're welcome, any time :)
Tanel. ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Saturday, September 13, 2003 6:49 PM > Tanel, > > Tried it out -- I stand corrected! Thanks for the heads up! > > -Tim > > > on 9/8/03 9:14 AM, Tanel Poder at [EMAIL PROTECTED] wrote: > > > Tim, > > > > AFAIK, when doing a rebuild the whole index is read using fast full scan, > > the branch blocks are just ignored. And sorting does occur, since fast full > > scan doesn't guarantee all keys to be returned in an order. (yes the keys > > come in ordered "chunks" because they are stored in ordered way inside leaf > > blocks, that might help the ordering alghoritm to complete faster). > > > > The benefit comes from that indexes are usually smaller in size than tables > > because they index only subset of a row, thus there are less IO operations > > needed when scanning data. > > > > Tanel. > > > > ----- Original Message ----- > > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > > Sent: Monday, September 08, 2003 4:49 PM > > > > > > Gunnar, > > > > Using ALTER SESSION to increase SORT_AREA_SIZE to some obscene number (i.e. > > several hundred Mb? A Gb?) may help, as long as you are running 8i or below > > or (if running 9i) the parameter WORKAREA_SIZE_POLICY is set to MANUAL. If > > WORKAREA_SIZE_POLICY is set to AUTO, then you may have to bump > > PGA_AGGREGATE_TARGET to something enormous instead... > > > > Are you making use of ALTER INDEX REBUILD to rebuild an index, or are you > > dropping and then creating? ALTER INDEX REBUILD runs much faster than a > > CREATE INDEX for two reasons: 1) the REBUILD reads the previous index¹s > > leaf nodes so there is less I/O since it is smaller and 2) there is no sort > > operation needed since the previous index¹s leaf entries are already sorted= > > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Tim Gorman > 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: Tanel Poder 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).
