DATAFILE??

Hi TO ALL

I have a doubt. Plz do reply. We have an Oracle 10g R1 db running here. we have 5 datafiles of 2 gb each. Now we use Oracle Forms as front end. Now as the daily transactions carry on i want to know how the data is stored in the database? I mean in which file out of the 5. Is it done randomly? Is there any query r method to find out in which datafile the data is stored.
All the files r online. ???

Plz do reply

Thank You

Imran Mohajir
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