Hi Juan, Thanks for suggesting the same. Due to management decision there wont be any upgrade. However i can change the session level parameter for the particular program . I am thinking for doing execute immediate to change the following parameter for my session optimizer_mode = CHOOSE optimizer_max_permutations = 2000 (now 80000) db_file_multiblock_read_count = 8 ( now 64 ) index_cost_adj = 80 index_cashing = 20 Do let me know if you suggest something. Current parameter are given in my original post. On 7/11/05, Juan Carlos Reyes Pacheco <juancarlosreyesp@xxxxxxxxx> wrote: > Hi Tanmoy, my two cents. > Why don't you try to create a test environment and move to CBO, > recalculate full statistics and see. > Maybe this could be your real solution. > This is risky, but this could solve several present and future problems at > once. > Anyway rule mode had been deprecated, there is no reason to continue using it. > Soon or later your system will have to move to cbo, and I think is better > soon. > -- Regards, Tanmoy -- "Time is the coin of life. Only you can determine how it will be spent." -- //www.freelists.org/webpage/oracle-l