Merge execution fails with: ORA-01555 on Siebel Upgrade

I am currently involved in a Siebel upgrade from version 7 to version 8 ( One of the problems I have found is relative to UNDO. The problem is an ORA-01555: snapshot too old: rollback segment number …

Since UNDO appeared as  substitute of  Rollback Segment this kind of error has  greatly reduced. Researching the subject, there is a note from Siebel  ID 477025.1, You can it in My Oracle Support  (formerly known as Metalink) detailing the error. The solution has been disable UNDO (setting it to manual) and create a large Rollback Segment.




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