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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Maximum height of an Oracle B-tree index
Jonathan,
just thinking here -- I don't know of any internal reasons for a maximum
B*-tree height in Oracle, right?
any branch block only knows about its children, so we can go on splitting as
long as we like ...
cheers,
Lex.
-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On
Behalf Of Jonathan Lewis
Sent: zaterdag 27 maart 2004 0:23
To: oracle-l_at_freelists.org
Subject: Re: Maximum height of an Oracle B-tree index
If you've got about 6 hours and about 24 GB of disk space free, I've got a script that will get you to height 24. You'll have to double the time and space to see what happens if you try to get to 25.
(So far I've built to height 20 in 18 minutes).
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
April 2004 Iceland http://www.index.is/oracleday.php June 2004 UK - Optimising Oracle Seminar
: > I remember a max height of 22 from 8i Data Server Internals materials,
but
: I can check it when I get home in few weeks.
:
: We'll I finally got home now and I see I remembered the max index height
: wrong - it's 24 (levels 0 to 23), at least this is stated in 8i DSI
: materials. But I don't see what kind of clever reason would restrict a
: B(whatever)-tree structures height at all...
:
: Tanel.
:
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Sat Mar 27 2004 - 06:02:43 CST
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