Hi all
We have rollback contention determined after queyring v$rollname and v$rollstat.
We are showing rollback segments as following:
RBS01 INITIAL =524288
NEXT =524288
MIN EXTENTS= 8
MAX EXTENT=32765
AND no OPTIMAL specified.

I would like to increase the size of the INITIAL & NEXT and set MINEXTET to 20.
Our db_block_size is 8196.

Can I increase initial and next by just multiplying their respective value to 2 to have large rollback segments?
EX= INITIAL =(524288 x2)=1048576
NEXT =(524288x2)= 1048576
MINEXTENT = 20
MAXEXTENT =??????? (Considering the figure what value may give to maxextent and Optimal?
OPTIMAL =???????
Total rollback segment online 34.
After creation of all the big rollbacks I will bring them all online and take all the little offline and drop then right?

Please advise