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Halloween Problem

Index Halloween Problem

In computing, the Halloween Problem refers to a phenomenon in databases in which an update operation causes a change in the physical location of a row, potentially allowing the row to be visited more than once during the operation. [1]

5 relations: Database, Donald D. Chamberlin, Halloween, Patricia Selinger, Update (SQL).


A database is an organized collection of data, stored and accessed electronically.

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Donald D. Chamberlin

Donald D. Chamberlin (born 21 December 1944) is an American computer scientist who is best known as one of the principal designers of the original SQL language specification with Raymond Boyce.

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Halloween or Hallowe'en (a contraction of All Hallows' Evening), also known as Allhalloween, All Hallows' Eve, or All Saints' Eve, is a celebration observed in a number of countries on 31 October, the eve of the Western Christian feast of All Hallows' Day.

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Patricia Selinger

Patricia G. Selinger is an American computer scientist and IBM Fellow, best known for her work on relational database management systems.

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Update (SQL)

An SQL UPDATE statement changes the data of one or more records in a table.

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[1] https://en.wikipedia.org/wiki/Halloween_Problem

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