UNDO Management - Config changes for OLTP and large background processes

Hi,
I am running 9i on a 2 node RAC cluster - Sun Solaris.
I use Automatic Undo.
The database is currently configured for OLTP and has 2 undo datafiles - 1GB in size and undo_retention set to default (900seconds)
I am about to start scheduling a batch job to run each night that will delete approx 1 million records each time it runs.
To get this to work without the dreaded Error -30036: ORA-30036: unable to extend segment by 8 in undo tablespace 'UNDO01', I have increased the undo datafiles to 5GB and the undo_retention to 4000.
The question is do I need to worry about switching between these settings - using the smaller values for daytime OLTP and the nighttime settings for the heavy processing?
What issues might I encounter if I just left the UNDO Management settings in place that I use for the large delete?

I would say no, leave the settings the highest level required to accomplish the work of the instance. Once the setting are correct for the instance, you should not have to change them around. They are really max setting for the heaviest load on your instance.

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