| 摘要 |
A data transferring section creates an available buffer by transferring all of the data records in one of work buffers to at least one of the other work buffers in a case where the available work buffer cannot be obtained even by fetching and outputting all of the data records having a sort order higher than the representative record of a data block to be next fetched from the work buffers. At this time, in at least one of the work buffers in which data records are added by the above data record transferring operation, the data records in each of the work buffers are sorted in the sort order.
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