RE: Function Based Index - Not Used ???

Naveen , these parameters look to be already set Doesn't FBI come in with 8.1.7 and Prem is on 8.16 and a comapatible of 8.10 is in place

Failing that, as my second guess, 2 privileges need to be assigned to the user (QUERY_REWRITE and CREATE INDEX). The 2nd one is obviously in place to allow the index to be created but I don't know about the first

The final point is whether the name column is not null , again I assume not but it is a possibility

John

-----Original Message-----
Sent: 29 May 2003 08:50
To: Multiple recipients of list ORACLE-L

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
>
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