Hi, my question is about the same, but more general. How can i force Oracle to use my prefered way of explain plan and not use CBO's. I mean, apart from stored outlines, it somehow seems to complicated. I would like to say what order and join types it should use. But, try as I might, I many times cannot force Oracle to use my way, even though I know it is possible, for I saw this kind of explain plan for that specific query..
I tried to use hints like ordered and use_hj etc. Can someone give some examples of full set of hints for some simple queries? Thx, rw > Hi, list friends: > We are using partition to archive history data in our > production OLTP database. We get great performance gains(Far > less disk io), but we also hit performance trouble sometimes. > So I am here ask for your experience. > > We used local index on all partitioned tables.We add/drop > partition monthly to archive the history data. > > But the trouble is, when add/drop partition is being done > on the partitioned table, CBO sometimes changed SQL execution > path.We implemented partition 2 monthes ago, and in the first > time, add/drop partition went on quite smoothly, but in the > second time we add/drop partition, two SQL (just TWO SQL) get > bad execution path and server load rushed to 10 times(from 2 > to 20 in uptime), all waiting for latch free event. It > severely affected our application. We are an online system > and we do not have scheduled time every month so we have to > add/drop partition while db is still running. > > So, with system still up and running, how do you add/drop > partition without changing the SQL execution path? We do not > have the time to reanalyze/dbms_stats the tables ,analyze > takes hours and if SQL execution path changed, during these > time, system is nearly unusable. > > I tried to import old > statistics(dbms_stats.import_table_stats), but did not fix > the problem. > So, can you share your experience on managing partitioned table? > > Regards > > Zhu Chao > www.cnoug.org > > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Wartiak Rastislav INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
