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

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The simplest kind of index that is needed is the “simple index”. In a simple index, the data that is placed in the index is specified before the index is created. In other words, the user identifies what is of interest to him/her before the index is created. The analyst determines that Word A, Word B, Word C, and so forth, are of interest before the indexing process commences. The system then passes through the text and determines the location of all of the occurrences of Word A, Word B, Word C, and so forth.

Simple indexes are fast to create and are good if the analyst really knows what needs to be analyzed before the indexing process begins. The problem with simple indexes is that it is costly for the analyst to change his/her ...

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