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Checking Integrity Constraints in Multidatabase Systems with Nested Transactions


Anne Doucet, Stéphane Gançarski, Claudia León, and Marta Rukoz

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Return to Multi and Federated Database Systems


Abstract

for centralized environments is extended. The principle of this solution consists of designating a sub-transaction which controls the checking of each integrity constraint. This sub-transaction is the smallest common ancestor (within the nested transaction tree) of all the sub-transactions which might violate the constraint. In the case of a multidatabase, it is necessary to take into account the constraint structure and the localization of the sub-transactions, to choose the site where the checking should be performed in order to minimize data transfers through the network. For this purpose, different checking strategies are presented depending on the type of the constraint to be checked.


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