The bind value is not a new value, it's still between low and high value of column BRN. While I wait for chance to activate 10053, I need your advice to put hint HASH_AJ temporarily for this case. I read this hint is already deprecated in 10g, any special attention for using it? Query with hint: select w.rowid r_id, w.acc, w.prod, w.system_account from mytab w where w.brn=:b1 and not exists ( select /*+ HASH_AJ */ 1 from myview v where v.brn=w.brn and v.acc=w.acc and v.prod=w.prod ); Best Regards, tomi --- Niall Litchfield <niall.litchfield@xxxxxxxxx> wrote: > The value of the bind on the first parse was most > likely different. > > On 7/19/07, Tomi Wijanto <restomi_w@xxxxxxxxx> > wrote: > > Hi all, > > > > I have weird problem for one SQL query, which has > > different execution plan before and after > restarting > > database. > > Before restart, it use NESTED LOOP (ANTI JOIN) > and > > never completed (total logical reads > 1 billion). > > After restart, it use HASH JOIN (RIGHT ANTI) and > > complete in 2 minutes. > > Optimizer environment was exactly same. Job was > > running from sqlplus. There is no histogram also. > > > > My concern is not about how to optimize this > query, > > but more about WHY the execution plan is different > > before and after restarting db. > > > > The only difference I aware was: > > Before restart, most of the table and indexes were > > already in memory. > > But could it impact execution plan? > > > > Your input is highly appreciated. > > > > Best Regards, > > tomi > > > > > > Query: > > ----- > > select > > w.rowid r_id, w.acc, w.prod, w.system_account > > from > > mytab w > > where > > w.brn=:b1 > > and not exists ( > > select 1 > > from myview v > > where v.brn=w.brn and v.acc=w.acc and > > v.prod=w.prod ); > > > > view 'myview' is a complex view with union (all) > of > > three subqueries. > > > > > > > > > ____________________________________________________________________________________ > > Looking for a deal? Find great prices on flights > and hotels with Yahoo! > > FareChase. > > http://farechase.yahoo.com/ > > -- > > //www.freelists.org/webpage/oracle-l > > > > > > > > > -- > Niall Litchfield > Oracle DBA > http://www.orawin.info > ____________________________________________________________________________________ Get the Yahoo! toolbar and be alerted to new email wherever you're surfing. http://new.toolbar.yahoo.com/toolbar/features/mail/index.php -- //www.freelists.org/webpage/oracle-l