| 摘要 |
PURPOSE:To refer or change a data base at a high speed and sequentially, by setting the bit of information of the data base before updating as null, and after updating as effective, at the completing time of the execution of a transaction. CONSTITUTION:A non-volatile medium with a short accessing time is used as an intermediate recording medium. An intermediate storage 20 is constituted of three areas : a cache area 30, a system history area 40, and a control information area 50. At the system history area 40, a bit of history information other than that of data base updating information is stored, and at the control information area 50, a control table required for the referring, the updating, and the recovery of the data base, is stored. The cache area 30 is divided into fixed length of records called as slots. The space of the data base to which the transaction refers, is divided to fixed areas called as pages, and the slot is prepared to store the page.
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