I see you're running on Oracle 9 there, and that can make a big difference. After posting my hypothesis, I created a test case, which behaved as I had predicted - but the behaviour changed in Oracle 9, and I had to do some tweaking.
Turns out my test case highlighted what looks like a but in the SORT costing in Oracle 8 for a sort/merge join. The Oracle 9 costing is better, so Oracle 9 didn't switch to an NL when Oracle 8 did. 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: Tuesday, January 06, 2004 9:14 PM > Jonathan, you're right. Interesting thing is that bitmap indexes, which were made for > DW processing and not for OLTP will also be considered for NL context in First_Rows mode. > Here is the proof, which also proves that I'm a lousy typist: > -- 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).
