How to increase number of data files parameter

Dear All,
I am facing problem in increasing number of data files associated with the DB. I have DB_FILES = 200 and want to set it to 300. DB was started with SPFILE.
Tell me how to increase this parameter. I dont want to stop DB also. I will be thankful if anyone guide me in both ways to stop DB and without stopping it.
Regards
Aqeel Nawaz

Madrid,
Please don't take it as nit-picking.Just wanted to point an enhancement in 10g regarding recreating control file for increasing number of datafiles.I am sure you must be aware about it.
Please see this link and this note,
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/dfiles.htm#sthref1340
When you issue CREATE DATABASE or CREATE CONTROLFILE statements, the MAXDATAFILES parameter specifies an initial size of the datafile portion of the control file. However, if you attempt to add a new file whose number is greater than MAXDATAFILES, but less than or equal to DB_FILES, the control file will expand automatically so that the datafiles section can accommodate more files.
From 10g onwards,the requirement to recreate teh control file is lifted.
Please correct me if I interpreted the note in a wrong way.
Regards
Aman....

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