my understanding is that an IOT uses a Logical Rowid called a urowid. When changes are made to the IOT, the row can change. The rowid may no longer be accurate. So Oracle 'guesses' where its located.
I believe its in the documentation.
>
> From: Jared Still <jkstill_at_cybcon.com>
> Date: 2004/04/28 Wed PM 01:50:47 EDT
> To: Oracle-L Freelists <oracle-l_at_freelists.org>
> Subject: Re: RE: Index-Organized Table experiences
>
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Received on Wed Apr 28 2004 - 13:11:42 CDT
