By Abraham Bookstein, Shmuel T. Klein (auth.), Prof. Dipl.-Ing. Dr. A. Min Tjoa, Prof. Dipl.-Ing. Dr. Roland Wagner (eds.)
Use and improvement of database and professional platforms are available in all fields of machine technology. the purpose of this ebook is to offer a wide spectrum of already carried out or simply being built database and professional structures. Contributions conceal new standards, suggestions for implementations (e.g. languages, types, garage structures), administration of meta information, approach architectures, and reviews received by utilizing conventional databases in as many parts of purposes as possibble (at least within the fields listed). the purpose of the e-book is to motivate a fruitful discussion among developement in perform, clients of database and professional structures, and scientists operating within the field.
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Extra info for Database and Expert Systems Applications: Proceedings of the International Conference in Vienna, Austria, 1990
Compute a rough estimate of the length. If the user merely wants to know about how many items were found, this may be sufficient. 3. g. for the fully-indexed method. Aside from the evaluation of lazy lists, there are several other factors that influence performance. Among those that we expect to have the largest impact are parallel evaluation and combining search methods. In more traditional languages, exploiting parallelism is computationally difficult, and may be accomplished only with expensive dataflow analysis.
Let's take an example of class definition. Figure 2 shows the definition of the class Employee. 2. 05»]. Figure 2. Defmition ofthe class Employee The properties of a class consist of attributes and methods. The attributes hold the state of an object. An attribute specification syntax is as follows. i)
2. More important, the evaluation regime implemented here means that most list items will probably never be evaluated at all, but can be used as if they were. What actually is evaluated depends almost entirely on what users actually ask to see. For this reason we are currently logging ARTFL users' sessions. We intend to look at the degree to which lazy evaluation helps in one of the next stages of this project. A cost might also be incurred if the evaluation of a list is forced in order to perform some other computation.