Suggestions please on my RBS parameters

[jt]

I have a db as backend for an i2 application. They are batch loading data to the database, and we repeatedly ran out of extents in the rollback segments.

I have 4 RBS. This is my current settings:

SQL> select usn,extents,optsize,hwmsize,wraps,extends from v$rollstat;

USN EXTENTS OPTSIZE HWMSIZE WRAPS EXTENDS
---------- ---------- ---------- ---------- ---------- ----------
2 21 10485760 10747904 0 0
3 21 10485760 10747904 0 0
4 21 10485760 10747904 0 0
5 21 10485760 10747904 0 0

SEGMENT_NAME INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS MAX_EXTENTS
------------------------------ -------------- ----------- ----------- -----------
SYSTEM 53248 53248 2 249
R000 512000 512000 2 249
R01 512000 512000 5 505
R02 512000 512000 5 505
R03 512000 512000 5 505
R04 512000 512000 5 505

So my question is that if I have total of 505 maxextents, and in v$rollstat extent column I have only upto 21, and no wraps and no extends, how come I am getting errors like:

Failure to extend rollback segment 3
Failure to extend rollback segment 3 because of 1562 condition

How should I modify my parameters to fix this?

[Sharma]

Can you change the batch loading process, If Yes, What about creating new RBS or changing the parameter of existing segment to High value of INITIAL & NEXT. Assign this RBS to Batch loading transaction, before it starts using Set transaction ............

[jrpm]

How much free space is left in the Rollbacks tablespace?
There should also be another error message after the 1562, particularly in the alert log.

You may be running out of tablespace room, not extents. But the next error message will point you closer to the problem.