Change Rollback Segment

I have a sql-script with many statements. It's working with autocommit. The Rollback Segment is too small. There are other bigger RBS on the DB.

How can I change the RBS on which the script is working? I do not want to do this by "set transaction set rollback segment", because I would have to name the RBS in too many places in the script.

I'd rather tell the session, with which RBS it should work. Or maybe there is a way to define the default RBS of the user?

TIA
Erich

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Erich-Scholz_at_t-online.de