Are any of the columns in the index declared to be NOT NULL - if not, then the hint is invalid because obeying it could produce the wrong answer.
Regards Jonathan Lewis http://www.jlcomp.demon.co.uk Coming soon a new one-day tutorial: Cost Based Optimisation (see http://www.jlcomp.demon.co.uk/tutorial.html ) Next Seminar dates: (see http://www.jlcomp.demon.co.uk/seminar.html ) ____England______January 21/23 ____USA_(CA, TX)_August 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]> Date: 24 January 2003 03:19 .... >Anyone have any problems with the CBO not using >a index when you know it is faster by forcing a >hint ? > >I have set the following ... > >Solaris >Oracle Version 8.1.7.4 > >block size = 8 >DB_FILE_MULTIBLOCK_READ_COUNT = 8 >mode = Choose > >also using Tim Gormans 90 and 50 values for the other optimizer parms. > >Select col1, col2, col3, blah1, blah2 from table order by col1, col2, col3; > > >Concatenate index on col1, col2, col3. > > -- 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).
