FreeLists / oracle-l / RE: reducing LIO's

["Mercadante, Thomas F" <thomas.mercadante@xxxxxxxxxxxxxxxxx>]

Sami,

You can use the concept of an IOT if your query is against one table.
Simply put all of the columns from your query into an index.  A simple test
would answer whether it is good for you or not.

Tom

-----Original Message-----
From: Sami Seerangan [mailto:dba.orcl@xxxxxxxxx] 
Sent: Thursday, March 31, 2005 9:48 PM
To: thomas.mercadante@xxxxxxxxxxxxxxxxx
Cc: Igor Neyman; sjaffarhussain@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: Re: reducing LIO's

Thomas,
I have a similar situation(query) and needs performance improvement.
My understanding is that IOT is good for lookup tables.  Can I use IOT
for transaction tables(gets updated every few mins).

Did anyone try clustering the tables involved in joins to improve the
performance?


On Thu, 31 Mar 2005 09:42:30 -0500, Mercadante, Thomas F
<thomas.mercadante@xxxxxxxxxxxxxxxxx> wrote:
> I agree.  I reduced a very slow OLTP summary query from 3 minutes to 5
> seconds using an IOT.  This query was used every time a user hit their
home
> page.
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