Re: function index for like '%string%'

How unpleasant, the answer I expected but didn't want to hear. At points of loopy desperation I've tried dumbest things to make this work, eg., creating the index as lower('%email_addy%') which produces the expected useless result in dba_ind_expressions:

SQL> create index idx_test
on test (lower('%email_addy%') ;

SQL> select index_name, column_expression from dba_ind_expressions where table_name = 'TEST'

INDEX_NAME COLUMN_EXPRESSION

----------   -----------------
IDX_TEST     '%email_addy%'

My suggested workaround to the developers is to store the string lower case. For some strings this is okay, but obviously not a great solution for strings which may be case-dependent.

fbi = f**ing boneheaded index :)

Suzy

"Joseph S. Testa" wrote:
>
> i spent about a week about 6 months ago looking for something to fill
> that possibility to no avail.
>
> joe
> Rachel Carmichael wrote:
> >
> > she knows why it isn't being used. What Suzy wants to know (and I do too,
> > because I have a similar situation) is if there is a way to create an index
> > that will let you search with the like clause.
> >
> > Unfortunately my gut instinct is that you can't make Oracle do that
> >
> > >From: "Hillman, Alex" <Alex.Hillman_at_usmint.treas.gov>
> > >Reply-To: ORACLE-L_at_fatcity.com
> > >To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > >Subject: RE: function index for like '%string%'
> > >Date: Fri, 01 Jun 2001 14:11:08 -0800
> > >
> > >index is not used because you have leading % in the like predicate.
> > >
> > >Alex Hillman
> > >
> > >-----Original Message-----
> > >Sent: Friday, June 01, 2001 5:09 PM
> > >To: Multiple recipients of list ORACLE-L
> > >
> > >
> > >
> > >I've created a function index for lower(column_name). However the query
> > >does
> > >a like comparison rather than equality so the index isn't used. Is there a
> > >way to create a function index for this?
> > >
> > >Here's the index and query:
> > >
> > >create index fx1_auth_users
> > >on auth_users (lower(current_email)
> > >tablespace app01_midx ;
> > >
> > >select current_email from auth_users
> > >where lower(current_email) like '%datsit.com%' ;
> > >
> > >Thanks much,
> > >Suzy
> > >--
> > >Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > >--
> > >Author: Suzy Vordos
> > > INET: lvordos_at_datsit.com
> > >
> > >Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> > >San Diego, California -- Public Internet access / Mailing Lists
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>
> --
> Joe Testa http://www.oracle-dba.com
> Performing Remote DBA Services, need some backup DBA support?
> For Sale: Oracle-dba.com domain, its not going cheap but feel free to
> ask :)
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Joseph S. Testa
> INET: teci_at_the-testas.net
>
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> San Diego, California -- Public Internet access / Mailing Lists
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: SuzyV
  INET: lvordos_at_datsit.com

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