Schema Transformation processors for federated objectbases

Tresch, Markus and Scholl, Marc (1993) Schema Transformation processors for federated objectbases. In: Proc. Database Systems for Advanced Applications (DASFAA '93), Daejeon, Korea.

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In contrast to three Schema levels in centralized object-bases, a reference architecture for federated objectbase Systems proposes five levels of Schemata. This paper investi-gates the fundamental mechanisms to be provided by an object model to realize the processors transforming be-tween these levels, namely Schema extension, Schema fil-iering, and Schema composition. It is shown, how compositum and extension are used for stepwise bottom-up integration of existing objectbases into a federation; and how extension and filtering support authorization on dif-ferent levels in a federation. A powerful View definition mechanism and the possibility to define subschemata (i.e., parts of a Schema) are the key mechanisms used in these processes.

Item Type:Conference or Workshop Item (Paper)
Subjects:DBIS Research > Publications
ID Code:328
Deposited By: Eva Mader
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Deposited On:08 May 2008 09:36
Last Modified:14 Oct 2011 10:25

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