摘要：Metric-temporal databases are a new database model thatcombines metric spaces with temporal databases to pro-cess similarity queries within a time interval or snapshot.The Historical FHQT is a metric-temporal index which hasshown to be competitive answering this type of queries.This index store a list of valid snapshots where each onecontains an Fixed Height Queries Tree that indexes all ob-jects existing at that instant. In this paper we present animprovement to this access method that consists in usingdifferent sets of pivots for the Fixed Height Queries Treethat correspond to consecutive time instants. The experi-mental results show this modification improves the filteringcapacity of the index.
