| 摘要 |
PURPOSE:To execute the hash retrieval by an optimized processing amount by changing the array of records at the same source address according to retriev al frequency. CONSTITUTION:An array modification means E modifies the array of the records with the same source address in a data file memory means A according to their retrieval frequency shown by a retrieval frequency memory means D. Accordingly, for retrieving a specific record, a hash retrieval means B can find it comparison times depending upon the retrieval frequency of the record. Namely, if the retrieval frequency of the record concerned is substantially higher than that of other record, it is retrieved earlier than the other. As a result the retrieval by the hash retrieval means B is optimized in general.
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