How to reduce oracle system datafile

Question

hi
i m working on data base whose system datafile file is around 5GB in size
n around 200 user in it.
i have aleady tarnsfer all user and its segment to another table space.
but when i pass this command: 'alter database datafile 'c:\oracle\oradata\system01.dbf' resize 4000m;
then its display error message that;ora03297 .
plz help me how i will reduce my system datafile size
Thanx

Answer 1

hi use this query to check the HWM of a tablespace associated datafile;
col fname format a75 justify c heading 'FileName'
col totsiz format 999,999,990 justify c heading 'Total|(KB)'
col avasiz format 999,999,990 justify c heading 'Available|(KB)'
col pctusd format 990 justify c heading 'Pct|Used'
comp sum of totsiz avasiz on report
break on report
select
total.file_name fname,
total.bytes/1024 totsiz,
nvl(sum(free.bytes)/1024,0) avasiz,
(1-nvl(sum(free.bytes),0)/total.bytes)*100 pctusd
from
dba_data_files total,
dba_free_space free
where
total.tablespace_name = 'TABLESPACE_NAME'
and total.tablespace_name = free.tablespace_name(+)
and total.file_id=free.file_id(+)
group by
total.tablespace_name,
total.file_name,
total.bytes;
Kamalesh JK