RE: Fragmentation ?

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Wed, 11 Jun 2003 07:42:15 -0700
Message-ID: <F001.005AF0E6.20030611065453@fatcity.com>

Vivek

Make sure you've read "How to Stop Defragmenting and Start Living" http://metalink.oracle.com/cgi-bin/cr/getfile_cr.cgi?239049 The authors point out that uniform extents stop fragmentation at the tablespace level. However they point out that there are other forms of fragmentation.

Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
[EMAIL PROTECTED] -----Original Message-----
Sent: Wednesday, June 11, 2003 9:15 AM
To: Multiple recipients of list ORACLE-L

Qs What is the advantage of having dba_tablespaces.ALLOCATION_TYPE = "UNIFORM" OVER
dba_tablespaces.ALLOCATION_TYPE = "USER" ?

With ALLOCATION_TYPE = "UNIFORM" , NEXT_EXTENT Size of the Object can NOT be Manually defined
in the Table Creation Script <storage (NEXT <Value>)> which is allowed when having allocation_type="USER" .

This allows Objects with Different NEXT_EXTENT Sizes to be Created in the SAME LOCALLY managed Tablespace & thus reduces Total Number of Extents for the respective Table. Our Application does have Objects of Dissimilar Sizes Existing tin the Same Tablespace .

Does ALLOCATION_TYPE = "UNIFORM" automatically imply NO Fragmentation Irrespective of the Number of Extents of the Object (in a Locally Managed Tablespace) ? Does it further imply NO further need to Look at Number of Extents of an Object in a Locally Managed Tablespace ?

NOTE Allocation_type can be made = "USER" by using the stored procedures :- dbms_space_admin.tablespace_migrate_from_local / dbms_space_admin.tablespace_migrate_to_local

Am i still Lost in the World of Oracle 7 ?

Thanks

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Author: VIVEK_SHARMA
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Author: DENNIS WILLIAMS
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