Fragmentation ?

From: VIVEK_SHARMA <VIVEK_SHARMA_at_infosys.com>
Date: Wed, 11 Jun 2003 06:34:03 -0700
Message-ID: <F001.005AF02D.20030611061452@fatcity.com>

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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