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SQL>show parameter undo

1555, 00000, "snapshot too old: rollback segment number %s with name \"%s\" too small"
// *Cause: rollback records needed by a reader for consistent read are
//        overwritten by other writers
// *Action: If in Automatic Undo Management mode, increase undo_retention
//          setting. Otherwise, use larger rollback segments

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ORA-01555: snapshot too old: rollback segment number string with name "string" too small
Cause: rollback records needed by a reader for consistent read are overwritten by other writers
Action: If in Automatic Undo Management mode, increase undo_retention setting. Otherwise, use larger rollback segments

SQL code:


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CREATE ROLLBACK SEGMENT rolltest STORAGE (INITIAL 10M NEXT 10M


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