Message-ID: <F001.004C4EC2.20020831021320@fatcity.com>
Date: Sat, 31 Aug 2002 02:13:20 -0800
To: Multiple recipients of list ORACLE-L <ORACLE-L@fatcity.com>
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From: "Sandeep Kurliye" <Sandeep@almoayyedintl.com.bh>
Subject: RE: Function-Based Index not working
Organization: Fat City Network Services, San Diego, California
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If CBO think - cost of FTS will be less than index scan then it will not =
use index.

HTH.


-----Original Message-----
From:	Marul Mehta [mailto:marul@zycus.com]
Sent:	Sat 8/31/2002 11:48
To:	Multiple recipients of list ORACLE-L
Cc:=09
Subject:	Function-Based Index not working

Hi,

Can you please help me out in solving this weird problem of =
funcation-based index not being used when I query the table.
This is the comand I fired and the result it returned me.

1. SQL> create table employees  (last_name varchar2(20));
    Table created.

2. SQL> CREATE INDEX upper_ix ON employees (UPPER(last_name));
    Index created.

Made the autotrace on and than:-

3. SELECT last_name FROM employees WHERE UPPER(last_name) IS NOT NULL  =
ORDER BY UPPER(last_name);
    no rows selected.

Execution Plan
----------------------------------------------------------
   0      SELECT STATEMENT Optimizer=3DCHOOSE
   1    0   SORT (ORDER BY)
   2    1     TABLE ACCESS (FULL) OF 'EMPLOYEES'


I fired without order by clause also but no use.
=20
Now can any body please let tell me why this Oracle is having a full =
scan of the employee table.

TIA,
Marul.


   =20


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-- 
Author: Sandeep Kurliye
  INET: Sandeep@almoayyedintl.com.bh

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