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
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- David

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Received on Thu Mar 18 2004 - 13:54:53 CST