not enough rollback segment

[admin]

Hi, all

My overnight job aborted last week along with the message:

ProcessFSEBITClassification.CLARITY: ORA-01555: snapshot too old: rollback segment number 6 with name "RBS5" too small.

It seems that the rollback segment is not enough, my oracle DBA thought The RBS are large enough for an OLTP system along with the amount of RBS. So I changed ORAOCI8 stage "Transaction Size" from 2000 to 100, then it worked OK.

This morning, it aborted again, with the same problem. What can I do now? reduce Transaction Size again, or add more rollback segment? Can anybody give me a recommendation?

Thanks in advance

Xiong

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