Indexed documents are arranged in the index according to a static ranking and partitioned according to static ranking. Index queries reference the first partition and move to a subsequent partition when a static rank for the subsequent partition is higher than a weighted portion of the target score added...http://www.google.es/patents/US7293016?utm_source=gb-gplus-sharePatente US7293016 - Index partitioning based on document relevance for document indexes
Index partitioning based on document relevance for document indexes