Re: Maximum height of an Oracle B-tree index

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>
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        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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