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Theses

TEMPOS : un modèle d'historiques pour un SGBD temporel

Abstract : A temporal DBMS must offer functionalities for data timestamping and history management. This thesis presents the TEMPOS historical model and the associated prototype which has been developed on top of the O2 DBMS. TEMPOS comprises a temporal data model, which allows to manage simple and complex temporal values observed at several temporal units. The set of units is extensible and the operations defined over temporal values are independent of the units being involved. Moreover, the model takes into account the multiplicity of external forms of temporal values. The TEMPOS historical model integrates the main functionalities needed by a DBMS to cope with the data historical dimensions. The definition of different historical datatypes (discrete, stepwise, interpolated) allows to set the meaning of input values and to interpolate the others. In TEMPOS, an history is composed of a chronicle (sequence of snapshots), a temporal domain and a temporal interpolation function. The model allows various structurations of histories by grouping instants together in several ways. Query operations on histories are based upon temporal extensions of the relational algebra and adaptations of operators on sequences, which allow to reason about succession in time. Updating operations are extended to deal with the temporal dimension. All the operations defined on histories are independent of their representation and their temporal units. The prototype consists of a temporal package of classes implementing the temporal model in O2 and a front-end processor TempOQL, which allows to deal with temporal values in OQL queries.
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https://tel.archives-ouvertes.fr/tel-00004924
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  • HAL Id : tel-00004924, version 1

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Jean-François Canavaggio. TEMPOS : un modèle d'historiques pour un SGBD temporel. Interface homme-machine [cs.HC]. Université Joseph-Fourier - Grenoble I, 1997. Français. ⟨tel-00004924⟩

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