Sanjay
Thank you for responding so promptly.
Considering the following
INITIAL=NEXT and OPTIMAL > MINEXTENTS*INITIAL

My new rollback segment size will be as follow.
INITIAL= 1048576
NEXT = 1048576
MINEXTENTS = 20
MAXEXTENTS =? (what's the new value?)0ld value=32765

OPTIMAL= 26214400 (ie 1048576*20*1.25)

The value of the orignal maxextent on the small rollback segment is 32765.

IS THERE ANY GUIDELINE TO INCREASE THE SIZE OF MAXEXTENTS?

And once I create the new rollback segments I will first bring them online, then take the old offline and drop them.

Can you create a new rollback segment rbs1, if you already have rbs1? or you first offline rbs1, drop it and then recreate rbs1.

Please advise.