Use of substr function will avoid the use of indexes in a table

i have one table which will contain some 3,00,000 records, it contains some 11 primary keys i am using some update statements to update some fields in the records (of 3,00,000 i will compare some 1,50,000 records with 1,50,000 another records) i am using substr function in all the select statements. whether usage of substr function will avoid the use of index
can any one clarify?

contains some 11 primary keys by this I suppose you mean to say the table has a composite PK on 11 columns.
i am using substr function in all the select statementsCould you please post your SQL statement?

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[svn:bz-trunk] 21292: Fix BLZ-639 - avoid the use of "==" when comparing strings.

Revision: 21292
Revision: 21292
Author:   [email protected]
Date:     2011-05-25 12:09:39 -0700 (Wed, 25 May 2011)
Log Message:
Fix BLZ-639 - avoid the use of "==" when comparing strings. Just check for null explicitly.
Ticket Links:
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Modified Paths:
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-- Created on 1/19/2010 by USER
declare
-- Local variables here
i integer;
str varchar2(2000);
str1 varchar2(2000);
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Edited by: Buga on Jan 19, 2010 9:57 AM
Included the table

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Use of substr function will avoid the use of indexes in a table

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