How to use text based index

Hi,
I want to use a text based index. The problem statement was i have to delete all those records which have column
'ABC%'
means data can be ABC1, ABC2, ABCl, ABCn
so i thought i would do like
delete from tab1
where col1 like 'ABC%'.
There are millions of records.
so i thought of optimizing the Query by using text based index. If my approach is right can you suggest how i can implement it and Is there any other way around?
Thanks
_vinod

Are you saying that simple b tree index would be used in a qurey where i have used LIKE operator? Yes. Not "would" but certainly "could", as long as wildcard is trailing.
Now whether it "would" depends on whether it's estimated to be the cheapest access path.

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From: Adobe Forums <[email protected]<mailto:[email protected]>>
Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>
Date: Thu, 20 Oct 2011 03:03:46 -0700
To: Leonard Rosenthol <[email protected]<mailto:[email protected]>>
Subject: how to use ICC based colorspace
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How to create function based index on REGEXP_LIKE funtion

Dear Gurus,
I have below table CDR
Name Null Type
STARTTIME NOT NULL DATE
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Hi,
you can do it that way :Scott@my11g SQL>create table test (name varchar2(30));
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Scott@my11g SQL>/
PLAN_TABLE_OUTPUT
Plan hash value: 140237472
| Id | Operation                   | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT            |       |     1 |    20 |     1   (0)| 00:00:01 |
|   1 | TABLE ACCESS BY INDEX ROWID| TEST |     1 |    20 |     1   (0)| 00:00:01 |
|* 2 |   INDEX RANGE SCAN          | MYFBI |     1 |       |     1   (0)| 00:00:01 |
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Hi,
Why is that I got different results for my queries?
Note that emp_date is indexed, so i dont want to use
a function to it.
QUERY1(full table scan)
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QUERY2
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2 /
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                                  8842
1 rij is geselecteerd.
Uitvoeringspan
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1 rij is geselecteerd.
Uitvoeringspan
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Uitvoeringspan
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Use this query instead:
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Uitvoeringspan
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My problem is as below
I m using oracle 8i data base
I have a table Dummy with column col1 .
I have created a function based index on col1
Now i try to update the table dummy using this function based index (i.e)
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