Function based indexes

From: Imma C. Rocco <imma_at_lycos.com>
Date: Thu, 11 Jul 2002 14:24:51 -0800
Message-ID: <F001.00495D28.20020711142451@fatcity.com>

Hi,
I have read that on Oracle 8.1.7 it is possible to create a function based index like the one: Create index ind1 on <table> (substr(<column_name>)) tabelspace ....etc
And if Oracle optimizer is in CBO mode and query_rewrite_enabled = true
query_rewrite_integrity = trusted
compatible = 8.1.0 or greater
A statement which has a where clause that involve a substr(<colum_name>) should use the index.

(*)I would like to know if it is also possible to create a function based index on a NVL function that involve a bind variable, because a have a statement like the one that follow: select 'x'
from <table>
where <col_name> = nvl(:p_aa, <col_name>)

This statement perform a full table scan on <table>

ps: if (*) is possible could you please give an sintax example?

Thanks
Imma

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Author: Imma C. Rocco
  INET: imma_at_lycos.com

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