RE: bitmap index Q.

GOOD exercise? I had to do it in school, automatic balancing, etc. in C++ You wanna talk about a nightmare... if it wasn't for the cute TA I would have never passed data structures!

That's probably the ONE THING I learned studying CSCI that actually directly applies to my job.

Jared Still <jkstill_at_bcbso.com> on 05/01/2000 01:00:32 PM

Please respond to ORACLE-L_at_fatcity.com

To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> cc: (bcc: Lisa Koivu/GELCO)

Subject: RE: bitmap index Q.

Hmm... That sounds like a good exercise.

Time to break out the 'Data Structures' book, and put it in the queue with the other 20 or so books I'm supposed to read.

Jared

On Mon, 1 May 2000, I.S. Manager wrote:

> Automatic tree-balancing is a basic feature of the btree algorithm. I wrote
> a btree function once just to get a feel for what it does, and I can tell
> you that it makes absolutely no difference whether the keys go in in
> sequential, reverse-sequential, or random order.
>
>
> At 02:49 PM 4/28/00 -0800, Jain, Akshay wrote:
> >Is it true that if data is loaded in *sequential* order, with indexing on,
> >the index gets lop sided. Thus only rebuilding the index(es) can
> >restore its beneficial, shallow and wide structure.
> >
> >Unless there is automatic tree-balancing for indexes that Oracle
> >does by itself?
> >
> >Akshay Jain
> >_______________________
> >Newcourt-CIT
> >Tel. (416) 507-5385
> >mailto:Akshay.Jain_at_cit.com
> >_______________________
> >
> >
> >-----Original Message-----
> >Sent: Friday, April 28, 2000 3:54 PM
> >To: Multiple recipients of list ORACLE-L
> >
> >
> >Hola!
> >
> >One of our data marts here had awful performance yesterday. The only thing
> >that
> >was different between yesterday and the previous days was that the load ran
> >with
> >all indexes, including bitmaps, on the tables. Only 10,000 rows were added
> >-
> >less than 1% change. The analyze was run for all tables to be hit by the
> >reports. However performance really bit yesterday until the indexes were
> >dropped and rebuilt.
> >
> >In class I remember talking about the tradeoff between a fast load/building
> >indexes and a slow load/leaving indexes up. Has anyone seen this type of
> >behavior before? I can not say for sure that the load is not updating the
> >fields the bitmap indexes were on.
> >
> >Any comments are appreciated.
> >
> >Lisa 'Almost Certified' Koivu
> >
> >
> >
> >--
> >Author:
> > INET: Lisa_Koivu_at_gelco.com
> >
> >Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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> >also send the HELP command for other information (like subscribing).
> >--
> >Author: Jain, Akshay
> > INET: Akshay.Jain_at_cit.com
> >
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> >
> ---
> Dennis Taylor
> ---
> The opinions expressed herein are mine. Get your own opinions!
> ---
> --
> Author: I.S. Manager
> INET: ismgr_at_pctc.com
>
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>

Jared Still
Certified Oracle DBA and Part Time Perl Evangelist ;-) Regence BlueCross BlueShield of Oregon
jkstill_at_bcbso.com - Work - preferred address jkstill_at_teleport.com - private

--
Author: Jared Still
  INET: jkstill_at_bcbso.com

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