Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Mailing Lists -> Oracle-L -> Re: index rebuild

Re: index rebuild

From: <Jared.Still_at_radisys.com>
Date: Thu, 18 Mar 2004 10:28:00 -0800
Message-ID: <OFB72F7E8B.7AA806CA-ON88256E5B.006548F4-88256E5B.00655AA6@radisys.com>


consider alter index coalesce

also consider dumping index blocks and determine if you have too much space
that is reusable due to a monotonically increasing key, and a lot of rows have
been deleted leaving nearly empty and non-reusable blocks.

Look on Jonathan Lewis' site, as I believe there is a good write up on this.

Jared

thump604_at_comcast.net
Sent by: oracle-l-bounce_at_freelists.org
 03/18/2004 08:43 AM
 Please respond to oracle-l  

        To:     oracle-l_at_freelists.org
        cc: 
        Subject:        index rebuild


There was some recent discusison on here regarding rebuilding indices based solely on height.

Is this a good criteria to use in determining what indices to rebuild: height is greater than 4
percentage wasted space on deleted entries compared to active entries is greater than 20%
percentage of deleted entries compare to active entries is greater than 20%

Should any other critera be followed and could indices be flagged under this criteria and still don't necessarily need to be rebuilt.

Thought and opinions please...

Thanks
--

- David



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


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 Thu Mar 18 2004 - 13:54:53 CST

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US