| 摘要 |
PURPOSE:To decrease a block read request and a write request by holding the updating information of an index accompanied to the updating of a data record, as a sort record, in case of updating the data record, and updating an index file in the order of a key value integrally after updating the data record. CONSTITUTION:A sort record group on an index record updating information storage means 5 rearranged by a sorting means 4 is read successively by an index record reading means 6, and an index on an index file 8 is updated by an index updating means 7. The index updating means 7 updates the index record existing on the index file 8 in accordance with an updating processing identifier 65, while an index identifier 61 has the same value.
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