By Dimitri Theodoratos, Timos Sellis (auth.), Mukesh Mohania, A Min Tjoa (eds.)
This publication constitutes the refereed court cases of the 1st foreign convention on info Warehousing and data Discovery, DaWaK'99, held in Florence, Italy in August/September 1999. The 31 revised complete papers and 9 brief papers provided have been rigorously reviewed and chosen from 88 submissions. The booklet is split in topical sections on information warehouse layout; on-line analytical processing; view synthesis, choice, and optimization; multidimensional databases; wisdom discovery; organization principles; inexing and item similarities; generalized organization principles and knowledge and net mining; time sequence information bases; information mining functions and information analysis.
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Extra info for DataWarehousing and Knowledge Discovery: First International Conference, DaWaK’99 Florence, Italy, August 30 – September 1, 1999 Proceedings
Mapping Schema Fig. 6. Communicate with Converter Module employee type dept refers to the department object, which employee works in; supv refers to the supervisor object of employee type; p o s i t i o n is a nested attribute, contains building and c i t y attributes; phone is a set of phone type. department type mgr refers to the manager object of employee type. location type This type can hold office-information for employees. phone type The phone attribute is the phone number of an employee.
The mapping method helps us make an uniform interface between a wrapper and an integrator. 1 Introduction In contradiction to on-demand approach (extract data only when processing queries) of traditional databases, data warehouse systems provide a in-advanced approach (interested data are retrieved from information sources in advance). Because processed information has been stored in data warehouse, there exists inconsistency between data warehouse and underlying information sources. According to the WHIPS (WareHouse Information Project at Stanford) architecture [HGMW+95], we can use Monitor/Wrapper components t o detect modification in information sources and t o maintain the consistency between information sources and data warehouse system.
The reason to use string as a data type is simple because integrator component can directly form a query by using these string and transform them into another type. Besides, each object has tostring() method in Java, so the transformation can be directly applied on every object. We can also define our class type, which overrides the method, to support new data types. -T. Horng et al. (D) Modafication Retriever Module For cooperative information sources, such as Oracle, we use triggers to record the modification information in another table, and periodically retrieve data from this table to notify integrator.