K.Torp,C.S.Jensen,andM.H.Bohlen. Layered Implementation of Temporal DBMSs---Concepts and Techniques.TR R-96-2037, Aalborg University, 1996.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....The design of embedded VTQL (denoted as VTQL, hereafter) does not rely on the existence of specific algorithms, but requires that such algorithms do exist. EVTQL will be implemented on top of a DBMS that supports embedded SQL. This implies that a layered architecture is adopted, as suggested in [20], 21] and [23] Finally, for simplicity in our discussion, we will assume that homogeneous valid time and tuple timestamping ( 13] is used, although the techniques presented here may easily be adapted to handle heterogeneous valid time and attribute timestamping. The remnant of this paper is ....

K. Torp, C. Jensen and M. Bhlen, "Layered Implementation of Temporal DBMSs-Concepts and Techniques", TimeCenter Technical Report TR-2, 1997 available from http://www.cs.auc.dk/general/DBS/tdb/TimeCenter/publications.html

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K.Torp,C.S.Jensen,andM.H.Bohlen. Layered Implementation of Temporal DBMSs---Concepts and Techniques.TR R-96-2037, Aalborg University, 1996.

....semantics. ffl The approximate semantics simplifies the extensionalization of tables referenced in queries. ffl The approximate semantics is more easily implementable in an existing temporal data model or in a layer on top of an existing relational DBMS, e.g. using a substitute value for NOW [30, 31]. ffl The effect of a delete or an update depends on when it is executed in the approximated semantics, whereas modifications are time independent in the accurate semantics. 8 Related Work Most prominently, this paper proposes definitions of modifications involving NOW and explores how the ....

K. Torp, C. S. Jensen, and M. H. Bohlen. Layered Implementation of Temporal DBMSs--- Concepts and Techniques. In Proceedings of the DASFAA Conference, pp. 371--380, 1997.

....to applications by interposing a stratum between an existing DBMS and the application. The stratum exploits the services already provided by the DBMS to offer temporal support to the application. Indeed, to be cost effective, this approach is used by some vendors to enhance their own systems [26, 27]. By adopting a stratum approach, it is possible to maximally reuse existing technology and relatively quickly make a temporal DBMS available to the application programmers so that they may benefit from the built in temporal support of a temporal query language. Among the disadvantages of using a ....

K. Torp, C. S. Jensen, and M. Bohlen. Layered Implementation of Temporal DBMSs---Concepts and Techniques. Proceeding of the Fifth International Conference On Database Systems for Advanced Applications, pp. 371--380, 1997. 33

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K. Torp, C. S. Jensen, and M. H. Bohlen. Layered Implementation of Temporal DBMSs-Concepts and Techniques. In Proceedings of the Fifth International Conference On Database Systems For Advanced Applications, DASFAA '97, Melbourne, Australia, April 1997.

....attributes for capturing temporal aspects to using timestamp attributs with built in semantics is an open problem. Yet another future direction is the study of efficient implementation techniques. The current prototype illustrates the feasibility of the language using a layered architecture [40]. This architecture can be used to identify bottlenecks of current DB technology with respect to temporal database applications. The findings may then prompt the development of new DBMS algorithms. This approach has already been pursued for coalescing [9] 8 Acknowledgements We greatly appreciate ....

K. Torp, C. S. Jensen, and M. H. Bhlen. Layered Implementation of Temporal DBMSs-Concepts and Techniques. In Proceedings of the Fifth International Conference On Database Systems For Advanced Applications, DASFAA '97, Melbourne, Australia, to appear April 1997.

....to applications by interposing a stratum between an existing DBMS and the application. The stratum exploits the services already provided by the DBMS to offer temporal support to the application. Indeed, to be cost effective, this approach is used by some vendors to enhance their own systems [25, 26]. By adopting a stratum approach, it is possible to maximally reuse existing technology and relatively quickly make a temporal DBMS available to the application programmers so they will benefit from the built in temporal support of a temporal query language. Among the disadvantages of using a ....

K. Torp, C. S. Jensen, and M. Bohlen. Layered Implementation of Temporal DBMSs---Concepts and Techniques. Proceeding of the Fifth International Conference On Database Systems for Advanced Applications, pp. 371--380, 1997.

....attributes for capturing temporal aspects to using timestamp attributs with built in semantics is an open problem. Yet another future direction is the study of efficient implementation techniques. The current prototype illustrates the feasibility of the language using a layered architecture [TJB97]. This architecture can be used to identify bottlenecks of current DB technology with respect to temporal database applications. The findings may then prompt the development of new DBMS algorithms. This approach has already been pursued for coalescing [BSS96] 8 Acknowledgements We greatly ....

K. Torp, C. S. Jensen, and M. H. Bohlen. Layered Implementation of Temporal DBMSs-Concepts and Techniques. In Proceedings of the Fifth International Conference On Database Systems For Advanced Applications, DASFAA '97, Melbourne, Australia, to appear April 1997.

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