R. Snodgrass. The temporal query language TQuel. ACM Transactions on Database Systems, 12(2):247--298, June 1987. Home/Search Document Not in Database Summary Related Articles Check |
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....it is usually necessary to combine the use of different types of reservations to guarantee the result of any transaction. Second, the system transparently verifies if the available reservations can guarantee the result of a mobile transaction written in unmodified PL SQL (unlike previous systems [12], no special function is used to access the reserved data items) Third, it implements the reservation model integrated with mobile transactions in a SQL based system. Published in the Proceedings of The First International Conference on Mobile Systems, Applications, and Services (MobiSys 2003) ....
....of the current value) Escrow reservation An escrow reservation provides the exclusive right to use a share of a partitionable resource represented by a numerical data item. For example, the stock of some product may be split among several salesmen. This reservation is based on the escrow model [12, 9]. The escrow model is applied to numerical data items that represent partitionable resources, where all items are identical e.g. the number of CDs in the stock, x (in section 4.5, we show how reservations can address problems with non identical resources e.g. seats in a train) The ....
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....temporal attributes of the relation. Any of the explicit attributes can be temporal, too. Our algorithms will work for any kind of join predicate P . This join is a natural generalization of the conventional join, with join predicate P , on non temporal relations, in that it is snapshot reducible [Sno87] to this join. We partition each temporal relation into a current and an old partition. Tuples thatfulfi the criterion = now, i.e. they are current, are placed in the current partition. Tuples that are logically deleted are placed in the old partition. As mentioned earlier, deleting a tuple ....
R. T. Snodgrass. The Temporal Query Language TQuel. ACM Transactions on Database Systems,12(2):247--298, June 1987.
Description Logics for Modelling Dynamic Information - Artale, Franconi, Mandreoli (2003) (1 citation) (Correct)
....Orthogonality [40] is another desirable principle: temporal constructs should be specified separately and independently for entities, relationships and attributes. Depending on the application requirements, the temporal support must be decided by the designer. Furthermore, snapshot reducibility [39] of a schema says that snapshots of the database described by a temporal schema are the same as the database described by the same Orange Generate g Juice [1,1] 5,5] Fig. 2. Generation relationships. schema where all the temporal constructs are eliminated and the schema is interpreted ....
R. T. Snodgrass. The temporal query language tquel. ACM Transaction on Database Systems, 12(2):247--298, 1987.
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....use of this infrastructure. between the system and its environment or between the internal objects involved in a particular execution of the system. There are numerous techniques used to describe the architectural views of a system: algebraic specifications [Wirs90] entity relationship diagrams [Chen76], automata [Hopc90] class diagrams [Rumb91] message sequence diagrams [ITU94] data flow diagrams [DeMarc79] as well as many others. In this paper, the Unified Modeling Language (UML) combines many of these notations and concepts into a coherent notation and semantics [Booc99] Fowl97] ....
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R. T. Snodgrass. The Temporal Query Language TQUEL. ACM Transactions on Database Systems, 12(2):247--298, June 1987.
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R. T. Snodgrass. The Temporal Query Language TQuel. ACM Transactions on Database Systems, 12(2):247--298, June 1987.
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R. T. Snodgrass. The Temporal Query Language TQuel. ACM Transactions on Database Systems, 12(2): 247--298 (1987).
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R. T. Snodgrass. The Temporal Query Language TQuel. ACM Transactions on Database Systems,12(2):247--298, June 1987.
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R. T. Snodgrass. The Temporal Query Language TQuel. ACM Transactions on Database Systems, 12(2):247--298, June 1987.
Semantics of Time-Varying Information - Christian Jensen And (1996) (6 citations) Self-citation (Snodgrass) (Correct)
....come to Tucson for additional sabbaticals during January August, 1992 and July, 1994 January, 1995. Rick returned the favor with several shorter visits to Denmark. Rick had previously worked on temporal query language design and implementation, in the context of his TQuel language [HS93, MS90, Sno87, SGM93, Sno93] and on temporal semantics, specifically characterizing the orthogonality of valid time and transaction time [SA86] Christian had previously worked on transaction time databases, specifically architecture [JMRS93, JM93] implementation [JMR91] and language support [JM92] In our ....
....true; later, the occurrence of another event renders that fact no longer valid. Hence, events and states are duals; states can be represented by their delimiting events, and events are implied by states. A conventional relation models the reality relevant to an enterprise as a single state [Sno87] This is often illustrated as a two dimensional table, with the tuples as rows and the attributes as columns. If nothing changes in reality, the tuples will remain in the relation. Otherwise, some tuples are removed and others are inserted into the relation. It is well known that database facts ....
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R. T. Snodgrass. The Temporal Query Language TQuel. ACM Transactions on Database Systems, 12(2):247--298, June 1987.
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....ER models that have specialization generalization constructs, constraints on how the entities of the superclass participate in the subclasses must be specified. In a temporal ER model, it would be natural to have both temporal versions of these, which apply over all of time, and snapshot reducible [19] versions, which apply in isolation at each single point in time. Table 2 describe these constraints in turn. Temporal Snapshot Reducible Key Constraint For all of time, an entity is uniquely identified by the value(s) of the key attribute (s) At each individual point in time, the value(s) ....
R. T. Snodgrass. The Temporal Query Language TQuel. ACM Transaction on Database Systems, 12(2):247--298, June 1987.
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