Abstract
Explicitly storing the transitive closure of a relation appears to be a solution providing fast access to recursively defined data. However, update propagations then have to be efficiently processed. This paper focuses on the minimization of the cost of the propagation of the updates from the basic relation to the deduced relation. Only a part of the transitive closure relation is influenced by the basic modification and has to be recomputed; the rest of the transitive closure remains untouched. Basic algorithms for instance- oriented propagations of insertion and deletion are proposed. Moreover, this paper investigates the consideration of set- oriented updates directly. We take into account a set of deleted and/or inserted tuples in a single manipulation. The proposed method maintains an arbitary set- oriented update in less than 2 passes over the transitive closure.
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© 1991 Springer-Verlag Berlin Heidelberg
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Cheiney, JP., Huang, YN. (1991). Set-oriented propagation of updates into transitively closed relations. In: Delobel, C., Kifer, M., Masunaga, Y. (eds) Deductive and Object-Oriented Databases. DOOD 1991. Lecture Notes in Computer Science, vol 566. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-55015-1_27
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DOI: https://doi.org/10.1007/3-540-55015-1_27
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