If we are talking about two sql only, maybe you can use stored outline. Yechiel Adar Mehish ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Tuesday, December 02, 2003 8:34 AM
> 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 > -- > Author: zhu chao > 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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Yechiel Adar 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).
