Oracle 9i resize datafile

1.

select *

from (

select owner, segment_name,

segment_type, block_id

from dba_extents

where file_id =

( select file_id

from dba_data_files

where file_name = :FILE )

order by block_id desc

)

where rownum <= :number

 

FILE_ID =>File identifier number of the database file

BLOCK_ID =>Starting block number of the extent

BLOCKS =>Size of the extent in Oracle blocks

2.

select value

from v$parameter

where name = 'db_block_size'

/

select 'alter database datafile ''' ||

file_name || ''' resize ' ||

ceil( (nvl(hwm,1)*&&blksize)/1024/1024 )

|| 'm;' cmd

from dba_data_files a,

( select file_id,

max(block_id+blocks-1) hwm

from dba_extents

group by file_id ) b

where a.file_id = b.file_id(+)

and

ceil(blocks*&&blksize/1024/1024)-

ceil((nvl(hwm,1)*

&&blksize)/1024/1024 ) > 0

/

 

SELECT

a.file_id,

a.file_name

file_name,

CEIL( ( NVL( hwm,1 ) * blksize ) / 1024 / 1024 ) smallest,

CEIL( blocks * blksize / 1024 / 1024 ) currsize,

CEIL( blocks * blksize / 1024 / 1024 ) -

CEIL( ( NVL( hwm,1) * blksize ) / 1024 / 1024 ) savings,

'alter database datafile ''' || file_name || ''' resize ' ||

CEIL( ( NVL( hwm,1) * blksize ) / 1024 / 1024 ) || 'm;' cmd

FROM

DBA_DATA_FILES a,

(

SELECT file_id, MAX( block_id + blocks - 1 ) hwm

FROM DBA_EXTENTS

GROUP BY file_id

) b,

(

SELECT TO_NUMBER( value ) blksize

FROM V$PARAMETER

WHERE name = 'db_block_size'

)

WHERE

a.file_id = b.file_id(+)

AND

CEIL( blocks * blksize / 1024 / 1024 ) - CEIL( ( NVL( hwm, 1 ) * blksize ) / 1024 / 1024 ) > 0

ORDER BY 5 desc

/