RE: Function Based Index - Not Used ???

Oops! didnot read your full message.

try setting OPTIMIZER_INDEX_COST_ADJ with alter session to a lower value

Regards
Naveen

> -----Original Message-----
> From: Naveen Nahata
> Sent: Thursday, May 29, 2003 1:20 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: Function Based Index - Not Used ???
>
>
> Don't remember but you need a few parameters set
> appropriately for the FB
> indexes to work.
>
> I guess one of the parameters is QUERY_REWRITE_ENABLED which
> should be set to
> TRUE and you also need to set QUERY_REWRITE_INTEGRITY to some
> appropriate
> value.
>
> Regards
> Naveen
>
>
>
> > -----Original Message-----
> > From: Prem Khanna J [mailto:jprem_at_kssnet.co.jp]
> > Sent: Thursday, May 29, 2003 12:25 PM
> > To: Multiple recipients of list ORACLE-L
> > Subject: Function Based Index - Not Used ???
> >
> >
> > Guys,
> >
> > create table Tab1 ( name varchar2(100),age int,state
> > varchar2(100),country varchar2(100));
> >
> > insert into tab1 values ('SCOTT',25,'TN','India');
> >
> > I have 20,00,000 records like above.
> >
> > create index idx1 on tab1 (upper(name));
> >
> > analyze table tab1 compute statistics;
> > analyze index idx1 compute statistics;
> >
> > select age from tab1 where upper(name)='SCOTT'; ---> this
> > will return around 50 records.
> >
> > ---------------------------------------------------------
> > 0 SELECT STATEMENT Optimizer=CHOOSE (Cost=2458
> > Card=262146 Bytes=2097168)
> > 1 0 TABLE ACCESS (FULL) OF 'TAB1' (Cost=2458
> > Card=262146 Bytes=2097168)
> >
> > --- INIT.ORA ----------------------
> > optimizer_mode=choose
> > compatible=8.1.0
> > query_rewrite_enabled=true
> > query_rewrite_integrity=trusted
> > -----------------------------------
> > It's Oracle 8.1.6/Win2K.
> >
> > When i add a HINT, IDX1 is used.Why is it so ?
> > Why this SELECT does not use index IDX1 w/o a hint ?
> >
> > TIA.
> > Jp.
> >
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: Prem Khanna J
> > INET: jprem_at_kssnet.co.jp
> >
> > Fat City Network Services -- 858-538-5051 http://www.fatcity.com
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>
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> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Naveen Nahata
> INET: naveen_nahata_at_mindtree.com
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
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>

DISCLAIMER:
This message (including attachment if any) is confidential and may be privileged. Before opening attachments please check them for viruses and defects. MindTree Consulting Private Limited (MindTree) will not be responsible for any viruses or defects or any forwarded attachments emanating either from within MindTree or outside. If you have received this message by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change and MindTree shall not be liable for any improper, untimely or incomplete transmission.

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Naveen Nahata
  INET: naveen_nahata_at_mindtree.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
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