Oracle 10g Database Hanging twice a day

My database server has 10g with MS 2003 server as OS.
Twice a day the database hangs and does disconnects all the users from local and remote locations.
Current SYSTEM tablespace has a size of 470 MB and is 98.86 in use, when I try to add another datafile as 'SYSTEM02.DBF' in the same path where other system data files are, I kept this operation running during weekends but datafile was not added.
Has it anything to do with the MS 2003 server no. of users.
Any other suggestions for SYSTEM Tablespace to be free.
Please reply.
Thanks
Ajaz Ahmed

Hi friends / sameer,
Sorry for the delay. Here is the attached alert.log file Since the data from foxpro was loaded into oracle on to oracle 10 g from 7th may the problem of database hanging started from the next day. I joined the organization on 22nd july.
Current SYSTEM tablespace has a size of 470 MB and is 98.86 in use, when I try to add another datafile as 'SYSTEM02.DBF' in the same path where other system data file is, it does not add. I kept this operation running during weekends but datafile was not added.
Has it anything to do with the MS 2003 server no. of users.
Any other suggestions for SYSTEM Tablespace to be free.
If you can get me your mail id then I can send the
attachment of alert.log file as [email protected] bounces back.
Thanks
Ajaz Ahmed

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