Re: Fragmentation & Locally Managed Tablespaces

From: Rachel Carmichael <carmichr_at_hotmail.com>
Date: Thu, 28 Jun 2001 06:51:38 -0700
Message-ID: <F001.0033BC28.20010628064724@fatcity.com>

Mike,

Thanks, I didn't really believe Oracle would "take back" the maxextents unlimited option, I just thought it was funny that the recommendation was now going back to the original extent recommendations :)

Rachel

>From: MHately_at_etech-uk.com
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: Re: Fragmentation & Locally Managed Tablespaces
>Date: Thu, 28 Jun 2001 04:35:35 -0800
>
>
>
>Rachel,
>That maximum isn't a hard limit. Oracle themselves impose no limit of this
>kind.
>After you use all of the available space in the segment header block, any
>additional space map entries are overflowed into additional extent maps
>within
>the segment.
>This means that because the used extent information isn't cached in the
>data
>dictionary, queries against dba_extents etc. can cause many blocks to be
>read
>from LMTs if the map entries have overflowed in this manner.
>
>Therefore, the limitation is more of a recommendation to ensure that good
>performance is maintained.
>
>Regards,
>Mike
>
>

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Author: Rachel Carmichael
  INET: carmichr_at_hotmail.com

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Received on Thu Jun 28 2001 - 08:51:38 CDT