peter, for the oltp users, they didn't give me an alert. but i'm testing a report as exactly so many joins, even the latest result comes from the result set not from table directly,,,, something like select * from (select .... from a,b where ... ( select .....)).... tested on 9i it tooks only 30min, but on 10g rac, till 2hours and never end.. :( could you point me which v$ ? regards ujang On 6/12/07, Peter McLarty <p.mclarty@xxxxxxxxxx> wrote:
Hi Ujang I have seen this behaviour. It happens going from 9 to 10 at any level. In the case I had was due to things doing joins whose performance changed due to the effects of the optimiser. You will have to take each case by itself and analyse it. I would consult with your business users for their worst performer and isolate the cause of that and then work back from there removing the most expensive issues It is likely as you take it apart you may fix a number of issues at the same time Look out for joins to v$ views as these performed badly Cheers Peter -----Original Message----- From: Ujang Jaenudin [mailto:ujang.jaenudin@xxxxxxxxx] Sent: Tuesday, 12 June 2007 03:14 PM To: oracle-l@xxxxxxxxxxxxx Subject: 10g vs 9i all, recently i have a dev machine 10g on itanium ia-64 another linux is itanium ia-64 with 9i the performance on 10g (10.2.0.3) is dropped for almost 1/3 from the 9i, if someone has the same experiences, pls share.... all these parameters doesn't help either... alter system set optimizer_features_enable='9.2.0' scope=both; alter system set "_optimizer_cost_based_transformation" =on scope=both; alter system set "_gby_hash_aggregation_enabled" = TRUE scope=both; -- regards ujang -- //www.freelists.org/webpage/oracle-l
-- regards ujang -- //www.freelists.org/webpage/oracle-l