Secondary indexes contain a logical rowid in version 9+. Oracle looks
for row at or near indexed logical rowid. If it finds it great. If it
does not find the row then the primary index structure is searched using
the PK.
Hope this clears up any confusion caused by my reply. The manual
contains more details of exactly what Oracle does and the cost of stale
guesses.
-- Mark D Powell --
-- --Original Message-- --
From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)]On Behalf Of Jared Still
Sent: Wednesday, April 28, 2004 1:51 PM
To: Oracle-L Freelists
Subject: Re: RE: Index-Organized Table experiences
Guess?
What does that mean?
An IOT is essentially a b*tree that is treated as a table.
What kind of guessing would be involved?
Jared
On Wed, 2004-04-28 at 10:15, ryan.gaffuri@(protected) wrote:
> We have alot of many to many relationships. IOTs sound like a good
> option.
However, our many to many relationships are in a high transaction
database. I remember reading that Oracle has to 'guess ' the location of
IOTs and that if you perform alot of DML those guesses can be
inaccurate.
>
> anyone have experience with this?
>
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