Patent ID: 7324988
Filing Date: 2008-01-29
Classification: G06F,Y10S

Abstract:
1. A method for parallel query processing, the method comprising the steps of: providing a set of node indices for text indexing a set of documents, each node text index covering a subset of the documents, each term of the node indices having an assigned precalculated global frequency measure, the global frequency measure being expressive of a frequency of documents containing the term in the set of documents and each node text index having an assigned precalculated quality measure, the quality measure being expressive of a difference between the global frequency measure of a term and the local frequency measure of the term within the subset of documents covered by the node ( determining if a quality of the distributed text index is sufficient on the basis of the quality measure of the node indices by performing the steps of: recalculating of the global frequency measures and of the quality measure of the nodes, if the quality is not sufficient; and calculating of rank scores on the basis of the global frequency measures.