Greg
My concern is How can I reuse the deleted space, I have 20Gb Table with 15Gb
Indexes, So I may not touch the table due to massiveness, I can do atleast
indexes rebuild for availing 3-4Gb back. So in that regard pct_used has
greater significance for reusing the space for future insertions.
Thank you all for your responses and valueble input.
Thanks
Raghu.
>From: Greg Moore <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
>Subject: Re: PCTUSED??
>Date: Wed, 06 Jun 2001 15:56:25 -0800
>
> > I have big growing tables has default PCT_USED 40%, But we delete data
>some
> > times one year or 2yrs data. What is optimum value for this parameter??
>I
> > may consider my database is oltp. So how can decide a correct value for
> > this???
>
>PCT_USED might not have any effect for you at all.
>
>If you keep inserting rows by date, the blocks will fill with rows where
>the
>date is the same for every row in the block, or close. Then if the only
>time you delete is when you delete an entire year's worth of data, entire
>blocks will become empty. That's going to cause them to go on the free
>list
>no matter what you set PCT_USED to.
>
>As the other reply implied, your main concern may be tables where, after
>the
>mass deletes, there are many blocks below the high water mark that are
>completely empty. This would take up a little disk space until they are
>filled, but the main concern would be that full table scans would take as
>long after the deletes as before, due to the need to read all blocks up to
>the high water mark (empty or full). So if that is a concern you could
>reorg the table.
>
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>--
>Author: Greg Moore
> INET: [EMAIL PROTECTED]
>
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Author: Raghu Kota
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