Add a hint to force it to use the index, and then check the costs - this may assist in telling you why the index was not chosen.
Also, maybe see what happens using IN instead of OR hth connor --- "Seefelt, Beth" <[EMAIL PROTECTED]> wrote: > > Hi everybody, > > I'm hoping someone can help me understand this. > > I have this query - > > SELECT ORDERID FROM WWW SHOPCART > WHERE UPPER(MEMBERNAME) ='198917777' ; > > I added an index on the column UPPER(MEMBERNAME) and > it works great. > > I have another query - > > SELECT ORDERID FROM WWW SHOPCART > WHERE UPPER(MEMBERNAME) ='198917777' OR > UPPER(MEMBERNAME)='1989155555'; > > and this query will not use the index at all. > > I can't understand why the optimizer won't choose to > use the function based index when there is an OR > clause. I've tried the same query with just > MEMBERNAME= and using an index on MEMBERNAME, and > the optimizer will use the index if I OR my > criteria together. > > Any ideas? > > Thanks, > > Beth > > -- > Please see the official ORACLE-L FAQ: > http://www.orafaq.com > -- > Author: Seefelt, Beth > INET: [EMAIL PROTECTED] > > Fat City Network Services -- (858) 538-5051 FAX: > (858) 538-5051 > San Diego, California -- Public Internet > access / Mailing Lists > -------------------------------------------------------------------- > 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). ===== Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) "Some days you're the pigeon, some days you're the statue" __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- 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).
