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" <Beth.Seefelt_at_TetleyUSA.com>
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: Beth.Seefelt_at_TetleyUSA.com
>
> 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: ListGuru_at_fatcity.com (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: hamcdc_at_yahoo.co.uk
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: ListGuru_at_fatcity.com (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).
Received on Fri Feb 15 2002 - 06:38:49 CST