Re: Maximum height of an Oracle B-tree index
- From: Jared.Still@xxxxxxxxxxx
- To: oracle-l@xxxxxxxxxxxxx
- Date: Wed, 10 Mar 2004 12:46:59 -0800
My thoughts mirrored Tims.
Though after seeing Jonathan Lewis force a very small index
to a blevel of 3 with the clever use of data and storage parms
and who knows what else, I decided there was a distinct possibility
that I was wrong.
I've refrained from asking Steve how he did this, but if I see him
at dinner this evening, I will find out and report back. :)
Jared
Live from HOTSOS
Tim Gorman <tim@xxxxxxxxxxxxx>
Sent by: oracle-l-bounce@xxxxxxxxxxxxx
03/10/2004 06:08 AM
Please respond to oracle-l
To: <oracle-l@xxxxxxxxxxxxx>
cc:
Subject: Re: Maximum height of an Oracle B-tree index
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@xxxxxxxxxxx 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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