Data warehouses definition

This situation definition can then be passed on to the Process Data Warehouse to search for matching experience information. In the example scenario, several different realizations are found and returned. This information is then presented to the expert in the PDW client front-end, as visible in Fig. 4.9. Two different visualizations can be applied here. A generic representation shows the concept instances, their attributes and relations in UML instance notation, while the specific representation in this case shows a graphical snapshot of the screw elements. 

Finally, in this Introduction, it is worthwhile to reproduce one of the several current definitions, in the Oxford English Dictionary, of the word simulate To imitate the conditions or behaviour of (a situation or process) by means of a model, especially for the purpose of study or training specifically, to produce a computer model of (a process) . The Dictionary quotes this early (1958) passage from a text on high-speed data processing A computer can simulate a warehouse, a factory, an oil refinery, or a river system, and if due regard is paid to detail the imitation can be very exact . Clearly, in 1958 the scientific uses of computer simulation were not yet thought worthy of mention, or perhaps the authors did not know about them. 

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