专利名称：Database retrieving method, apparatus and
storage medium thereof
发明人：Masaharu Yoshiyama,Katsushi Wakiyama申请号：US09911784申请日：20010724
公开号：US20020120617A1公开日：20020829
专利附图：
摘要：A comparison between a cost required when retrieval is performed after anindex corresponding to a retrieval condition is generated and a cost required when entireretrieval is performed is made. If the cost required when the entire retrieval is performed
is higher, it is determined whether or not an applicable index exists among alreadygenerated indexes. If an applicable index does not exist, an index corresponding to theretrieval condition is generated. A database is then retrieved by using the generatedindex.
申请人：FUJITSU LIMITED
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