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Blanken, Henk (1991)
Types: Article
New applications in the area of office information systems, computer aided design and manufacturing make new demands upon database management systems. Among others highly structured objects and their history have to be represented and manipulated. The paper discusses some general problems concerning the access and storage of complex objects with their versions and the solutions developed within the AIM/II project. Queries related to versions are distinguished in ASOF queries (asking information valid at a certain moment) and WALK-THROUGH-TIME (WTT) queries (obtaining trend information concerning a certain period). In the paper some new algorithms to handle such queries are presented. A brief analysis gives an indication about the performance of query processing in historical databases.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

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    • P81 P. Pistor and F. Andersen, Designing a generalized NF' model with an SQL-type language interface, in: Proc. VLDB, Kyoto. Japan (1986) 278- 298.
    • [I91 P. Pistor and R. Traunmueller, A data base language for sets, lists, and tables, Technical Report TR 85.10.004, IBM Scientific Center. Heidelberg, West Germany, 1985.
    • PI B.-M. Schueler, Update reconsidered, in: G. M. Nijssen, ed., Architecture and Models in Data Base Management Systems (North-Holland Publ. Camp.. Amsterdam. 1977) l-19-164.
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