| 摘要 |
PURPOSE:To receive a comparatively long interactive transaction to the same data simultaneously by checking the contradiction of revision operation depending on the contention condition altogether plural journal files. CONSTITUTION:The user A revises the content of a data alpha from X to Y in the operation 1. In this case, the content of the revision is preserved in the journal file of the user A in a form of a revision command and not reflected on a data base. Moreover, the user B revises the value of the data alpha from X to Z in the operation 4. The content of revision is stored in the journal file of the user B similarly. The journal files of the users A, B are integrated in the operation 5 to check the contradiction. In this case, since two operations or over the revisions are applied to one and same data, a contradiction check list is outputted.
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