Re: Maximum height of an Oracle B-tree index

From: Tim Gorman <tim_at_sagelogix.com>
Date: Wed, 10 Mar 2004 07:08:29 -0700
Message-ID: <BC746F6D.11407%tim@sagelogix.com>

It would take a heckuva lot of space, even with DB_BLOCK_SIZE = 512 and PCTFREE=99 on the index, to get BLEVEL over 10...

Hat's off to Steve on getting it to 20+...

on 3/9/04 7:18 AM, Richard Foote at richard.foote_at_bigpond.com wrote:

> Hi All,
>
> I'm currently writing a rather detailed paper for our local user group on
> Index Internals, tentatively titled "Index Internals - Rebuilding The
> Truth". I haven't had this much fun with tree and block dumps for quite a
> while ;)
>
> One of the many myths I'm exposing is the "rebuild if index has more than 2,
> 3, 4, 42, whatever levels". Now to get an honary mention in the paper (what
> more reward can one wish for !!), I would love to know who on the list has
> created an index with the greatest height and perhaps a little info on it's
> circumstance.
>
> Steve Adams once mentioned to me creating an index with 20+ levels, can
> anyone else come close ?
>
> Thanks for any replies.
>
> Richard
>
>
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Received on Wed Mar 10 2004 - 08:16:59 CST