Thanx Mr.Reydp but i have another query,
We have 3 redolog groups of 1.2mb each, but when i am
importing large tables ,oracle warns me of redolog file size,
and also it takes 30 to 40 minutes to import one table,
so is it necessary to increase the existing redolog group size
or increase the number of groups(1.2mb each).
I hope i am clear.
Do clear me on this oracle basics.

Sanctus.