| 摘要 |
PURPOSE:To omit the page-over check with a continuous row data chain within a page by discriminating the chain display of the continuous row data using a chain field between the inside of a page and the boundary of a page respectively. CONSTITUTION:In a data scan mode, a file access processing part 9 sets the access start position of a page area 12 of a main memory 11 to a pointer 10 and reads out the row data. In this case, a chain field 15 is checked. Then the row data length is added to the pointer 10 if the value of the field 15 is equal to (1)00(2), i.e., both the page number and the offset are equal to (1)0(2). While a page-over phenomenon, i.e., a fact that the next data exists on other page is recognized when the value of the field 15 is not equal to (1)00(2). Then the page shown by the page number of the field 15 is loaded from a DASD 16, and the pointer 10 is replaced to give the second scan to the relevant page.
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