Need query to find the minimum size of a datafile

Hi All,
I need to reduce the size of a datafile. Before that i need to find out how far i can reduce the size of the datafile. Please help
DB version:11.2.0.3
OS:AIX 6.1

Below SQL will ask you blocksize (I guess it is default i.e. 8192) :
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
It will tell you upto how much extend you can shrink your datafile.
Regards
Girish Sharma

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Array.jpg ‏72 KB

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