Note in-line. Regards Jonathan Lewis http://www.jlcomp.demon.co.uk/faq/ind_faq.html The Co-operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/seminar.html Optimising Oracle Seminar - schedule updated July 20th ----- Original Message ----- From: "Wolfgang Breitling" <breitliw@xxxxxxxxxxxxx> >> Otherwise I practice "plan stability" meaning "if the statistics >> don't change, the plans won't". Beg to differ - for example: The fixed predicate: last_update_date >= "calculated constant of 28 days ago" is likely to have a selectivity that changes as time passes, with a possible change in plan, precisely BECAUSE the statistics haven't changed. ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------