I think you have to be a little careful how you phrase your comment here.
In your list there are some things which FORCE the use of CBO, even if the optimizer_mode is set to RULE; and there are some features which are activated ONLY IF the cost based optimizer is invoked. Off the top of my head, the following force CBO when they appear in an SQL statement � Partitioned tables and indexes � Index-organized tables � SAMPLE clauses in a SELECT statement � Parallel tables/indexes and the following are only recognised and used when the CBO has kicked in � Reverse key indexes � Function-based indexes � Query rewrite (materialized views) � Progress meter � Hash joins � Bitmap indexes and bitmap join indexes � Star transformations � Partition Views � Index skip scans and on these two I pass: � Star joins � Extensible optimizer Jonathan Lewis http://www.jlcomp.demon.co.uk Author of: Practical Oracle 8i: Building Efficient Databases Next Seminar - Australia - July/August http://www.jlcomp.demon.co.uk/seminar.html Host to 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: 12 April 2002 19:46 Raj, Keep in mind that the CBO will be defaulted whenever the following is present: � Partitioned tables and indexes � Index-organized tables � Reverse key indexes � Function-based indexes � SAMPLE clauses in a SELECT statement � Parallel execution and parallel DML (i.e. presence of DEGREE on Tables/Indexes) � Star transformations � Star joins � Extensible optimizer � Query rewrite (materialized views) � Progress meter � Hash joins � Bitmap indexes and bitmap join indexes � Partition Views � Index skip scans -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jonathan Lewis INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- 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).
