Where Does the Data Come From Managing Data Integration With Source Tagging Ca
Where Does the Data Come From Managing Data Integration With Source Tagging Ca
Y Richard Yng Yuh Richard Wang
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20 (3) The polygen query processor can derive the information that Genentech is from the Alumni Database's BNAME relation and Company Database's FNAME relation from the pKjIygen schema and the information of (ONAME, (AD, CD)). His information can be shown to the user upon request with a simple mapping. In this simple example, the data source information can be obtained by inspection from the polygen schema. The intermediate source information is not observable from the polygen schema. In a fede...rated database system with hundreds of databases in which a polygen query is optimized to select only the relevant databases for information retrieval, the data source information observed from the polygen schema is a suf)er set of the result obtained by the PQP. We now turn our attention to other theoretical issues of source tagging. 5. The Necessary and Sufficient Condition of Source Tagging The polygen model presented in Section 2 is based on the assumption that the source is tagged at the cell level after the data has been retrieved from a local database.
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