db reorg?

Hi
we have a 10.2 database that is like this:

select  sum(bytes)/1024/1024 from dba_segments;

SUM(BYTES)/1024/1024
--------------------
259525.374


SQL> select sum(bytes)/1024/1024 from dba_data_files;

SUM(BYTES)/1024/1024
--------------------
422298.839

Does this mean we can look for objects to perform re org?

CP.


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