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05.14.2008 at 10:54AM PDT, ID: 23402449
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8.2

explain plan on function based index

Asked by tvgkarthik in Oracle 10.x

We are using Oracle database 10g Enterpise Edition Release 10.2.0.1.0.


I have the following query and gets result in cost as 12539

TMDM@TMDM.REGRESS.RD> EXPLAIN PLAN FOR
2 SELECT * FROM A A
3 left join r r
4 ON r.rid = A.rid
5 WHERE r.rabbr='1';

Explained.

If i do the same query with upper clause result in cost is 16456
TMDM@TMDM.REGRESS.RD> EXPLAIN PLAN FOR
2 SELECT * FROM A A
3 left join r r
4 ON r.rid = A.rid
5 WHERE UPPER(r.rabbr)='1';

Explained.

now I create a function based index
create index id1 on r(upper(rabbr));

Now the cost for the following query is 16455

TMDM@TMDM.REGRESS.RD> EXPLAIN PLAN FOR
2 SELECT * FROM A A
3 left join r r
4 ON r.rid = A.rid
5 WHERE UPPER(r.rabbr)='1';

How can i get the cost as 12539 but I need to use upper clause in comparison. but creating function based index did not help much.

I am attaching more explain plan details.

Help is appreciated.
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[+][-]05.14.2008 at 11:00AM PDT, ID: 21566919

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Zone: Oracle 10.x
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Solution Provided By: angelIII
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Solution Grade: A
 
 
[+][-]05.14.2008 at 01:07PM PDT, ID: 21568173

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