Thanks for all who responded. > ---------- > From: Prem Khanna J[SMTP:[EMAIL PROTECTED] > Reply To: [EMAIL PROTECTED] > 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 <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > ************************************************************************** This email (including any attachments) is intended for the sole use of the intended recipient/s and may contain material that is CONFIDENTIAL AND PRIVATE COMPANY INFORMATION. Any review or reliance by others or copying or distribution or forwarding of any or all of the contents in this message is STRICTLY PROHIBITED. If you are not the intended recipient, please contact the sender by email and delete all copies; your cooperation in this regard is appreciated. ************************************************************************** -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Veeraraju_Mareddi INET: [EMAIL PROTECTED]
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