Oracle DB Error ORA-01555 snapshot too old: rollback segment number string with name "string" too small

Oracle DB Error ORA-01555 snapshot too old: rollback segment number string with name "string" too small

The following is the cause of this error:

Rollback records needed by a reader for consistent read are overwritten by other writers.

Action you can take to resolve this issue: If in Automatic Undo Management mode, increase the setting of UNDO_RETENTION. Otherwise, use larger rollback segments.


Tags: Database, Education, Software




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