Halloween Problem

Halloween Problem

In computing, the Halloween Problem refers to a phenomenon in databases in which an update operation produces a change in the physical location of a row, possibly producing the row to be visited more than once during the operation.

The name was given because it was discovered on Halloween day.

References

* [http://www.mcjones.org/System_R/SQL_Reunion_95/sqlr95-System.html The 1995 SQL Reunion (Protokoll)]
* [http://blogs.msdn.com/mikechampion/archive/2006/07/20/672208.aspx The "Halloween Problem" for XML APIs] , Mike Champion's weblog.


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