Hi, thanks to all suggestions, I did my best to fixe the paper based on your commentaries, about cost adj, it tookme some time to investigate to have a more serious and global opinion. The only interesting I could find for most expert users are the "good hints" from Tom Kyte, I included in the paper. :) Thanks for any other suggestions or mistake you could find. http://www.geocities.com/juancarlosreyesp/101basictunningonOracle9i.pdf There is a limit in that site, so if you get an error, you can retry tomorrow, if joe Testa can upload the file, I think he will post the link :) Juan Carlos Reyes Pacheco OCP Database 9.2 Standard Edition ---------------------------------------------------------------- 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 -----------------------------------------------------------------