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Building the Unstructured Data Warehouse: Architecture, Analysis, and Design by Krish Krishnan, W. H. Inmon

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A final strategic, architectural consideration for managing the volumes of data in the unstructured data warehouse is that of arranging indexes into two “sectors”. One sector is the primary sector. Data found in the primary sector is data that is easily and readily available to the end user for analysis. Data found in the secondary sector can be accessed, but must first be queued up for processing. By dividing data into two sectors, primary and secondary (or active and passive), the analyst/designer can ensure that when analysis is performed, it is done only against the data that is of most interest. Stated differently, when data is all grouped together and analysis is done against it, it is likely that many machine ...

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