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

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Yet another type of index is one based on clusters of information. In an index based on clusters of information, three or more words are supplied as an argument and the byte limit is supplied as well. The cluster is determined when the three or more words are found within the byte limitation that has been provided. Figure 7.13 shows a cluster query.

Figure 7.13 Clustered index

In Figure 7.13, it is seen that the words “sky”, “sun”, and “mountain” are provided within the byte limit of 150 bytes. The number of places where the words occur in the proximity provided by the byte limits is shown.

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