Fragmentation in tablespace in oracle 9i

Question

Hi All,
We have oracle 9.2.0.8 installed in solaris 9, database size is 1.5 TB, we are looking for the tablespaces which are suffering from the fragmentation.
We have locally manged tablesapaces in the database. so can you please tell me, is there any tablespace fragmentation in the locally managed tablespace in oracle 9i, and if it is there than how to relove the situation.?
thanks in advance

Answer 1

If you mean by fragmentation, a number of free space areas in the data files - sometimes called honeycombing, this script will show them to you.
SELECT  'free space'      owner,
        ' '               object,
        ' '               obj_type,
        f.file_name,
        s.file_id,
        s.block_id,
        s.blocks,
        s.bytes/1048576   mbytes
  FROM  dba_free_space s,
        dba_data_files f
WHERE  s.file_id = &file_id
   AND  s.file_id = f.file_id
UNION
SELECT  owner,
        segment_name,
        DECODE(segment_type, 'TABLE',          'T',
                             'INDEX',          'I',
                             'ROLLBACK',       'RB',
                             'CACHE',          'CH',
                             'CLUSTER',        'CL',
                             'LOBINDEX',       'LI',
                             'LOBSEGMENT',     'LS',
                             'TEMPORARY',      'TY',
                             'NESTED TABLE',   'NT',
                             'TYPE2 UNDO',     'U2',
                             'TABLE PARTITION','TP',
                             'INDEX PARTITION','IP', '?'),
        f.file_name,
        s.file_id,
        s.block_id,
        s.blocks,
        s.bytes/1048576
  FROM  dba_extents s,
        dba_data_files f
WHERE  s.file_id = &file_id
   AND  s.file_id = f.file_id
ORDER
    BY  file_id,
        block_id
However, when you look at the report you will see that in a locally managed tablespace, all of the free space 'chunks' are all 8 blocks, or a multiple of 8 blocks. This means that all of these free space chunks are able to be (re)used. And, they will be used. There is no need to do anything unless there is a pressing need to give disk back to the OS.