Thanks for all who responded.
> ----------
> From: Prem Khanna J[SMTP:jprem_at_kssnet.co.jp]
> Reply To: ORACLE-L_at_fatcity.com
> Sent: Monday, September 22, 2003 1:59 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: How do we know that an index need to be rebuilt.
>
> That's the doc. i mailed raju.
> Thanx Mladen.
>
> can i add a question here :
>
> when is it appropriate to use BITMAP index ?
> seems it has lot of restrictions.
> read docs about it ...still confused.
>
> say, i have a big table with 50,000,000 records in a OLTP env.
> it has column SEX which will have either MALE or FEMALE.
> the table will have frequent insert/delete too.
> often this SEX column is included in many queries.
>
> this being my case, can i use bitmap index on this column ?
>
> or can u give a simple example for when a bitmap index can be used ?
>
> Regards,
> Jp.
>
> 22-09-2003 17:04:40, Mladen Gogala <mgogala_at_adelphia.net> wrote:
> >There is a Metalink note 77574.1 entitled "Guidelines on When to Rebuild
> a B-
> >Tree Index" which explains how to use "validate structure" and
> index_stats
> >table. It is far too scientific to ever put into the script. Explanation
> >for the rule of thumb is simple: if number of index blocks is big that
> means
> >that the number of deleted entries is likely to be big, so let's rebuild
> it.
> >As I said, rebuilding indexes is not often necessary and is usually done
> for
> >all the wrong reasons. Quality of the rule of thumb, therefore, doesn't
> really
> >matter.
>
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Prem Khanna J
> INET: jprem_at_kssnet.co.jp
>
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Received on Mon Sep 22 2003 - 04:04:43 CDT
