How to Split a Large datafile

Hi Folks,
I have problem here in oracle 10g running on Windows 2003(32 bit), we have a datafile(.dbf) of size 21GB and we are not able to copy during cold backup OS throwing below error,so we are working with OS vendor on this. Please let me know if any better way to split datafiles in oracle.
Os error: insufficient system resources exist to complete the requested service.
Thanks
Raghu

There is no direct oracle command to split the datafile. Instead you have to use workaround for this.
Do you 21 GB datafile completely occupied by data. Check with the bellow given query.
select tablespace_name,bytes/1024/1024 from dba_segments where tablespace_name='21 GB tablespace'
A) Shrink all the objects in that datafile, With this you will be able to free space from the objects by resetting high water mark.
If it is not occupied completely resize it with command. Alter database datafile 'file_name' resize 20gb; Reduce it until you get error message that datafile contains data beyond resize value.
B) Create one more tablespace and move few of the tables from 21 gb tablespace to new tablespace with command and then rebuild moved table index.
alter table table_name tablesapce new_tablespace_name ;
rebuild index index_name_of moved_table rebuild tablespace_name;
Then resize the 21 gb datafile;
Edited by: sac on Sep 24, 2009 4:39 PM

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