Re: Maximum height of an Oracle B-tree index
- From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Sat, 27 Mar 2004 15:00:29 -0000
Lex,
I've just written a new script to prove
the point. It takes a couple of seconds
to run on 9.2 and bombs out with
ORA-00600 [6051]
when you hit the blevel = 24 / height = 25
So whatever the reason, the documentation
is correct.
(The script doesn't fail on 10.1, because the
leaf-block split algorithm seems to have changed)
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
----- Original Message -----
From: "Lex de Haan" <lex.de.haan@xxxxxxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Saturday, March 27, 2004 1:59 PM
Subject: RE: Maximum height of an Oracle B-tree index
: I should have looked in my own documentation, of course -- thanks for the
: correction Jonathan...
: kdxcolev is indeed part of each branch or leaf index block, and it is UB1.
I
: also found the same note, saying that the max value is 23, so we have max
24
: levels (0 thru 23) but unfortunately, I don't have an explanation why :-(
:
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