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ORA-01555 snapshot too old

 
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vj.jain
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Joined: 10 Aug 2007
Posts: 87
PostPosted: Tue Apr 14, 2009 5:28 pm    Post subject: ORA-01555 snapshot too old Reply with quote
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 the setting of
UNDO_RETENTION. Otherwise, use larger rollback segments.
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