| 摘要 |
PROBLEM TO BE SOLVED: To shorten time required for the updating and elimination processing of plural indexed sequential files and to improve throughput. SOLUTION: An index read processing means 5 reads an index block, traces the lowest order level entry and checks whether or not the index block is extended. When it is extended, it is judged that an index tree structure is formed based on a record address and read is performed. Also, for a non-extended index block, it is judged as an index tree based on a normal key and a conventional read processing is performed.
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