Prasad: Yet another semi-join killer. Have you tried forcing a NL join (hoping that NL semi-join is slightly better!). You can specify the init.ora parameter _always_semi_join to nested_loops if you want to use the NL semi-join. The other option is to completely disable the semi-join. This can be done by setting the parameter to 'off'. You can set this in session-level and try the query. If that works, you can use a logon-trigger to set this parameter before running the query and turn it back after the query completes. In this case, you are not using this parameter for instance-wide. Pls let me know how it goes, otherwise you can send me the 10053 trace and I can tell you why it is using semi-join ;) > I would like to know if there is any way to disable hash semi join > (do not > want to disable hash joins) either at the instance level (by > specifying any > parameters in init.ora) or at the query level by specifying hint. I > have > gone thru the documentation but did not find any way to disable it. > There > is a hidden parameter '_always_semi_join' and has the value 'CHOOSE'. > I > tried to disable it by specifying various values (FALSE, NONE etc) in > init.ora but no success. Also, even if it works, specifying this ===== Have a nice day !! ------------------------------------------------------------ Best Regards, K Gopalakrishnan, Co-Author: Oracle Wait Interface: Oracle Press 2004. http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/ __________________________________ Do you Yahoo!? Yahoo! Mail - 50x more storage than other providers! http://promotions.yahoo.com/new_mail ---------------------------------------------------------------- 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 -----------------------------------------------------------------