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You can use Undo Advisor to set UNDO_RETENTION and the required undo tablespace size. You can open the Undo Advisor using the Database-> Diagnose-> …
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ORA-01555 Snapshot Too Old / ORA-30036: unable to extend segment by string in undo tablespace
ORA-01555 Snapshot Too Old The “ORA-01555 Snapshot Too Old” error usually comes in long-running queries. In Oracle, previous changes of the data are retained in …
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