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there is excellent site [url]http://www.ixora.com.au/home.htm[/url] with really genious solutions for ORA-01555.
One of solutions is to have a process to put uncommited transaction into EVERY rollback segment: that prevents oracle from rolling onto old rollback entries required by a query.
It makes sense to look close to erro message: SNAPSHOT TOO OLD. It really means the most ugly reason for this error: no one can predict how long to keep old undo records.
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