Snapshot too old in undo tablespace in 9i?

Hello Group,  

I just upgraded a database to Oracle 9.2.0.3 from 8.1.7. I created an undo tablespace with 10 (default) undo segments... however, during an export I got the following message:  

ORA-01555: snapshot too old: rollback segment number 15 with name "_SYSSMU15$" too small

I thought this was a thing of the past... According to the documentation, if an undo segment gets full, it starts using idle ones... also, the undo tablespace still had a lot of room to grow...  

Any insights will be welcome.  

Thanks  

Abraham Guerra
Oracle DBA
American Family Insurance

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